There is a huge list of adjectives that start with O in English. Adjectives are the part of speech that modify nouns or pronouns. The qualify, limit, or specify, providing more information about the noun or pronoun.
Table of Contents
Adjectives that Start with O
The letter O is ripe with adjectives. There are several prefixes that can be added to words to make a new adjective.
- Omni: means “all” or every.” Example: omnidirectional
- Open: means “accessible” or “having no enclosure.” Example: openhanded
- Out: as an adjective, out generally means “more than” or “better than.” Example: outgrow
- Over: as an adjective, over generally means “upper” or “higher.” Example: overhead
Some of these words will include a hyphen and some may not. Regardless of grammatical rules, in casual writing, the hyphen may or may not be present.
Some words with these prefixes are included here, but there are many more possibilities.
List of Descriptive Adjectives that Start with O
Below are 100 descriptive adjectives that start with O.
- Oak
- Oaken
- Obligated
- Obliging
- Oblique
- Obliterable
- Obliterated
- Oblivious
- Oblong
- Obscure
- Observable
- Observant
- Obstinate
- Obstructed
- Obstructive
- Obtainable
- Obtrusive
- Obtuse
- Obvious
- Occasional
- Occipital
- Occluded
- Occupational
- Occupied
- Oceanic
- Ochre
- Octangular
- Octogenarian
- Odious
- Odorless
- Off
- Offbeat
- Offensive
- Offhand
- Official
- Offshore
- Offstage
- Old
- Olden
- Older
- Olfactory
- Olive
- Omissible
- Oncological
- Oncoming
- One
- Ongoing
- Only
- Onshore
- Opaque
- Open
- Opening
- Operant
- Operating
- Opinionated
- Opponent
- Opportunist
- Opposite
- Optic
- Optional
- Oral
- Orange
- Orbital
- Orchestral
- Ordained
- Ordeal
- Ordered
- Ordinary
- Oriental
- Oriented
- Ornate
- Orthopedic
- Orwellian
- Ostensive
- Other
- Out
- Outbound
- Outdoor
- Outgoing
- Outlandish
- Ovation
- Overage
- Overall
- Overcast
- Overcoming
- Overhead
- Overland
- Overly
- Overnight
- Overshot
- Overstuffed
- Overt
- Overweight
- Ovid
- Own
- Owned
- Ownerless
- Oxidized
- Oxlike
List of Positive Adjectives that Start with O
Below are 70 adjectives that start with O that indicate something positive.
- Obedient
- Objective
- Obligated
- Obliging
- Observable
- Observant
- Observational
- Obtainable
- Obvious
- Occurrent
- Official
- OK
- Okay
- Olympian
- Olympic
- Omnibus
- Omnidirectional
- Omnipotent
- Omnipresent
- Omniscient
- On
- One
- Onetime
- Ongoing
- On-going
- Online
- Only
- Opalescent
- Opaline
- Open
- Opened
- Open-ended
- Openhearted
- Opening
- Open-minded
- Operable
- Operant
- Operatic
- Operating
- Operational
- Operative
- Opportune
- Opportunist
- Opportunistic
- Optimal
- Optimistic
- Optimum
- Optional
- Opulent
- Oracular
- Orchestral
- Ordained
- Ordered
- Orderly
- Organic
- Organized
- Orientated
- Orientating
- Oriented
- Original
- Originative
- Ornamental
- Ornate
- Orotund
- Orthodox
- Over
- Overabundant
- Overall
- Overjoyed
- Overt
List of Negative Adjectives that Start with O
Below are 50 adjective words that start O that indicate something negative.
- Oafish
- Obdurate
- Obese
- Objectionable
- Obligated
- Obligational
- Obligatory
- Obliterable
- Obsessive
- Obsolete
- Obstinate
- Obstreperous
- Obstructed
- Obstructive
- Obtrusive
- Obtuse
- Obvious
- Occluded
- Occult
- Occupied
- Odd
- Odious
- Off
- Offensive
- Oily
- Old
- Oldest
- Omissible
- Omissive
- Only
- Oozy
- Opponent
- Opportunist
- Opportunistic
- Opposite
- Oppressive
- Outcast
- Outclassed
- Outdated
- Outlaw
- Outlawed
- Outmoded
- Outraged
- Outrageous
- Overactive
- Overaged
- Overaged
- Overbearing
- Overburdened
- Owing
List of Personality Adjectives that Start with O
Below are 30 adjectives that start with O that describe a personality.
- Oafish
- Obedient
- Objective
- Obliging
- Obnoxious
- Obsessional
- Obsessive
- Obstinate
- Officious
- Opinionated
- Optimistic
- Organized
- Ostentatious
- Outgoing
- Outraged
- Overachieving
- Overanxious
- Overbearing
- Overconcerned
- Overcritical
- Overemotional
- Overexcited
- Overfocused
- Overindulgent
- Overjoyed
- Overmodest
- Overprotective
- Overwhelmed
- Overwrought
- Overzealous
List of Adjectives that Start with O to Describe a Person (not Personality)
Below are 50 adjectives that describe a person that start with O.
- Objectionable
- Obscene
- Odd
- Odious
- Offensive
- OK
- Okay
- Old
- Older
- Oldish
- Open
- Openhanded
- Orderly
- Ordinary
- Outcast
- Outclassed
- Outdated
- Outdoorsy
- Outgoing
- Outlandish
- Outlaw
- Outmoded
- Outrageous
- Outright
- Outspoken
- Outspread
- Outstanding
- Overachiever
- Overbooked
- Overburdened
- Overcharged
- Overcoached
- Overcommitted
- Overcounted
- Overdeveloped
- Overdosed
- Overdressed
- Overeducated
- Overexerted
- Overexerting
- Overexposed
- Overextended
- Overfatigued
- Overfed
- Overfulfilled
- Overinformed
- Overnighter
- Oversteered
- Overweight
- Overwhelming
O Adjectives | Image
List of Adjectives that Start with O
Adjectives that Start with Oa, Ob
- Oafish
- Oak
- Oaken
- Obdurant
- Obdurate
- Obedible
- Obedient
- Obediential
- Obedt
- Obeisant
- Obeisaunt
- Obese
- Obfuscatory
- Obituary
- Object-based
- Objectionable
- Objectionable
- Objectional
- Objective
- Objectless
- Object-oriented
- Objectual
- Oblate
- Oblationary
- Obligate
- Obligated
- Obligational
- Obligatory
- Obliged
- Obliging
- Oblike
- Oblimin
- Oblique
- Obliquid
- Oblite
- Obliterable
- Obliterated
- Obliterative
- Oblivious
- Oblong
- Obnoxious
- Obscene
- Obscurant
- Obscure
- Obsequious
- Observable
- Observant
- Observational
- Observed
- Observing
- Obsessed
- Obsessional
- Obsessive
- Obsignatory
- Obsolescent
- Obsolete
- Obsoleter
- Obstacle-ridden
- Obstacular
- Obstetric
- Obstetrical
- Obstetricious
- Obstetrick
- Obstinant
- Obstinate
- Obstreperous
- Obstructed
- Obstructive
- Obstruent
- Obtainable
- Obtrusive
- Obtuse
- Obtuse-angled
- Obverse
- Obviating
- Obvious
Adjectives that Start with Oc
- Occasional
- Occidental
- Occipital
- Occluded
- Occlusal
- Occluse
- Occlusional
- Occlusive
- Occulent
- Occulomotor
- Occult
- Occultic
- Occultistic
- Occultive
- Occultural
- Occupational
- Occupiable
- Occupied
- Occurrent
- Ocean-going
- Oceanic
- Oceanward
- Ocellar
- Ocellated
- Ocher
- Ochre
- Ochreous
- Ochrous
- Ocreate
- Octabasic
- Octacore
- Octacosanoic
- Octacyclic
- Octagonal
- Octahedral
- Octal
- Octameric
- Octangular
- Octanoic
- Octogenarian
- Octogynous
- Octoic
- Octoid
- Octolateral
- Octolocular
- Octonary
- Octonionic
- Octonocular
- Octopaminergic
- Octopartite
- Octopean
- Octopetalous
- Octopian
- Octopic
- Octopine
- Octoploid
- Octopodal
- Octopodous
- Octopoid
- Octopoidal
- Octopolar
- Octosyllabic
- Octuple
- Ocular
Adjectives that Start with Od
- Odd
- Oddish
- Odds-on
- Odd-toed
- Odic
- Odiferous
- Odinic
- Odious
- Odobenine
- Odometric
- Odometrical
- Odontoid
- Odorant
- Odoriferous
- Odorless
- Odorous
- Odourful
- Odourless
Adjectives that Start with Oe
- Oecumenic
- Oecumenical
- Oedematous
- Oedipal
- Oenological
- Oenophilic
- Oestral
- Oestrogenic
- Oestrous
Adjectives that Start with Of
- Off
- Off-air
- Off-base
- Off-beam
- Offbeat
- Off-book
- Off-broadway
- Off-campus
- Off-center
- Off-colour
- Offduty
- Offenceless
- Offended
- Offending
- Offensive
- Off-field
- Off-guard
- Offhand
- Off-hand
- Official
- Officiary
- Officinal
- Officious
- Offish
- Off-key
- Off-kilter
- Off-limits
- Offline
- Off-line
- Off-peak
- Off-piste
- Off-put
- Offputting
- Off-putting
- Off-road
- Off-sale
- Offscreen
- Off-screen
- Offshore
- Offside
- Offsides
- Offsite
- Off-site
- Offstage
- Off-street
- Off-target
- Off-the-ball
- Off-the-cuff
- Off-the-peg
- Off-the-rack
- Off-the-record
- Off-the-shelf
- Off-the-shoulder
- Off-the-wall
- Off-track
- Off-white
- Oft-repeated
Adjectives that Start with Og, Oh, Oi
- Ogival
- Ogreish
- Ohmic
- Oily
Adjectives that Start with Ok, Ol
- Ok
- Okay
- Old
- Olde
- Olden
- Older
- Oldest
- Oldfashioned
- Old-fashioned
- Old-growth
- Old-hat
- Oldish
- Oldline
- Old-line
- Old-maidish
- Old-school
- Old-time
- Old-world
- Ole
- Oleaceous
- Oleaginous
- Oleanolic
- Olefinic
- Oleic
- Olent
- Oleochemical
- Oleographic
- Oleophilic
- Oleophobic
- Oleoresinous
- Oleose
- Oleraceous
- Olfactive
- Olfactory
- Oligaemic
- Oligarchic
- Oligarchical
- Oligomeric
- Oligopolistic
- Oligosaline
- Oligosemic
- Oligosynaptic
- Oligotrichous
- Oligotrophic
- Oliguric
- Olivary
- Olive
- Olivelike
- Olympian
- Olympic
Adjectives that Start with Om
- Omakase
- Omani
- Omasal
- Ominous
- Omissible
- Omissive
- Ommatidial
- Omnibus
- Omnipotent
- Omnipresent
- Omniscient
- Omnivorous
- Omohyoidean
- Omophagic
- Omophagous
- Omosternal
- Omotic
- Omphacine
- Omphacitic
- Omphalic
- Omphalinoid
Adjectives that Start with On
- On
- On-air
- Onanistic
- On-camera
- On-campus
- Once-removed
- Oncogenetic
- Oncogenic
- Oncogenomic
- Oncologic
- Oncological
- Oncoming
- One
- One-armed
- One-day
- One-eighth
- One-eyed
- One-fifth
- One-fourth
- One-gallused
- One-half
- One-handed
- Oneiric
- One-legged
- One-ninth
- One-note
- One-off
- One-on-one
- One-piece
- One-pot
- One-quarter
- Onerous
- One-seventh
- One-shot
- Onesided
- One-sided
- One-sixth
- One-stop
- One-tenth
- One-third
- Onetime
- One-time
- One-to-one
- One-touch
- One-track
- One-way
- Ongoing
- On-going
- On-hand
- Onioned
- Onionless
- Onionlike
- Oniony
- Oniric
- Onirocritic
- Onkus
- Onlest
- Onlie
- Online
- On-line
- Onlooking
- Only
- On-off
- Onomastic
- Onomatopoeic
- On-road
- Onrushing
- On-scene
- Onscreen
- On-screen
- Onshore
- Onside
- Onsite
- On-site
- Onstage
- On-stage
- On-the-job
- On-the-spot
- Ontic
- Ontogenetic
- Ontologic
- Ontological
- Onward
- Onygenaceous
- Onymous
- Onyx
Adjectives that Start with Oo, Op
- Oo
- Oob
- Oofy
- Oolitic
- Oozy
- Opacating
- Opacifiable
- Opacous
- Opacular
- Opalescent
- Opaline
- Opaque
- Open
- Openable
- Open-air
- Open-and-shut
- Open-armed
- Open-book
- Opencast
- Opencut
- Opened
- Open-ended
- Open-eyed
- Open-faced
- Open-handed
- Open-hearted
- Open-hearth
- Opening
- Open-minded
- Open-mouthed
- Open-plan
- Opensightly
- Opensource
- Opephoroid
- Operable
- Operant
- Operatic
- Operating
- Operational
- Operationalist
- Operative
- Opercular
- Operculate
- Operculated
- Operose
- Ophidian
- Ophiolitic
- Opiate
- Opinionated
- Oppilative
- Opponent
- Opportune
- Opportunist
- Opportunistic
- Opposable
- Opposed
- Opposing
- Opposite
- Oppositional
- Oppositive
- Oppressed
- Oppressional
- Oppressive
- Opprobrious
- Opsonic
- Optative
- Opthalmic
- Optic
- Optical
- Optimal
- Optimific
- Optimistic
- Optimum
- Optional
- Optoelectronic
- Optokinetic
- Optomotor
- Optospintronic
- Optothermal
- Optotypic
- Optronic
- Opulent
- Opuntiaceous
Adjectives that Start with Or
- Oracular
- Oral
- Orange
- Orangey
- Orangish
- Orangy
- Oratorial
- Oratorian
- Oratorical
- Orbicular
- Orbiculate
- Orbital
- Orbitary
- Orbitual
- Orbless
- Orblike
- Orchestral
- Orchestrated
- Orcish
- Ordained
- Ordeal
- Orderable
- Ordered
- Orderly
- Ordinal
- Ordinary
- Ordinate
- Ordurous
- Orectic
- Oregonian
- Organic
- Organismal
- Organismic
- Orgasmic
- Orgastic
- Orgiastic
- Orgulous
- Orient
- Oriental
- Orientated
- Orientating
- Orientational
- Oriented
- Orienting
- Origenian
- Origenist
- Origenistic
- Originable
- Original
- Originary
- Originative
- Originless
- Orinasal
- Orinocan
- Orkish
- Ornamental
- Ornate
- Ornery
- Ornithogenic
- Ornithological
- Ornithophilous
- Orogastric
- Orogenic
- Orogenital
- Orographic
- Orographical
- Orolabial
- Orolingual
- Orological
- Oromucosal
- Oronasal
- Oroqen
- Orosensory
- Orosirian
- Orotund
- Orphaned
- Orphic
- Orthodontic
- Orthodox
- Orthoepic
- Orthogenetic
- Orthogenic
- Orthognathic
- Orthogonal
- Orthograde
- Orthologous
- Orthometric
- Orthopedic
- Orthoptic
- Orthorhombic
- Orthostatic
- Orthotopic
- Orthotropic
Adjectives that Start with Os
- Os
- Oscillating
- Oscillatory
- Oscine
- Oscitant
- Osculating
- Osculatory
- Osmobiotic
- Osmolar
- Osmometric
- Osmotic
- Osseous
- Ossicular
- Ossiculate
- Ossiferous
- Ossified
- Ossom
- Os-specific
- Osteal
- Ostensible
- Ostensive
- Ostentatious
- Osteoarthritic
- Osteogenetic
- Osteogenic
- Osteoid
- Osteopathic
- Osteoporotic
- Ostial
- Ostrich-like
Adjectives that Start with Ot
- Other
- Otherwise
- Other-worldly
- Otic
- Otoscopic
- Ototoxic
- Otterless
- Otterlike
- Otter
Adjectives that Start with Ou
- Out
- Out of work
- Out-and-out
- Outback
- Outboard
- Outbound
- Outbred
- Outcast
- Outclassed
- Outcoming
- Outcut
- Outdacious
- Outdate
- Outdated
- Outdoor
- Outdoorsy
- Outer
- Outermost
- Outfitted
- Outflowing
- Outflung
- Outgoing
- Outgunned
- Outjutting
- Outland
- Outlandish
- Outlaw
- Outlawed
- Outlined
- Outlying
- Outmoded
- Outmost
- Out-of-body
- Out-of-character
- Out-of-context
- Out-of-court
- Out-of-date
- Out-of-order
- Out-of-pocket
- Out-of-print
- Out-of-service
- Out-of-state
- Out-of-town
- Out-of-work
- Outraged
- Outrageous
- Outright
- Outshore
- Outside
- Outsize
- Outsized
- Outspoken
- Outspread
- Outstanding
- Outward
- Ouvrierist
Adjectives that Start with Ov
- Oval
- Ovaloid
- Ovarian
- Ovate
- Ovation
- Ovenproof
- Oven-proof
- Over
- Overabundant
- Overachiever
- Overachieving
- Overactive
- Overage
- Overaged
- Overaggressive
- Overalert
- Overall
- Overalled
- Overanxious
- Overapt
- Overarm
- Overattentive
- Overawed
- Overbanked
- Overbearing
- Overblown
- Overbold
- Overbooked
- Overbreathed
- Overburdened
- Overbusy
- Overcareful
- Overcast
- Overcautious
- Overcharged
- Overcivilized
- Overclad
- Overclaimed
- Overclear
- Overclose
- Overclothed
- Overcluttered
- Overcoached
- Overcoated
- Overcoatless
- Overcoming
- Overcommitted
- Overcomplicated
- Overconcerned
- Overconfident
- Overconscientious
- Overconscious
- Overconsiderate
- Overcounted
- Overcritical
- Overcurious
- Overdamped
- Overdelicate
- Overdependent
- Overdetermined
- Overdeveloped
- Overdocumented
- Overdominant
- Overdone
- Overdoped
- Overdosed
- Overdramatic
- Overdressed
- Overdue
- Overeager
- Overeducated
- Over-educated
- Over-elaborate
- Overemotional
- Overemphatic
- Overenthusiastic
- Overexcitable
- Overexcited
- Overexerted
- Overexerting
- Overexposed
- Overextended
- Overfamiliar
- Overfatigued
- Overfed
- Overflowing
- Overfocused
- Overfond
- Over-fond
- Overforceful
- Overforested
- Overforward
- Overfragrant
- Overfraught
- Overfree
- Overfreighted
- Overfrequent
- Overfriendly
- Overfriezed
- Overfruitful
- Overfucked
- Overful
- Overfulfilled
- Overfull
- Overfurnished
- Overfussy
- Overgenerous
- Overgreedy
- Overgrown
- Overhand
- Overhanded
- Overhasty
- Overhead
- Overheated
- Overhyped
- Overinclusive
- Overindebted
- Overintense
- Overinvested
- Overinvolved
- Overionized
- Overish
- Overjealous
- Overjittery
- Overjoyed
- Overjoyous
- Overjubilant
- Overjust
- Overkeen
- Overladen
- Overland
- Overlarge
- Overlayered
- Overloaded
- Overlookable
- Overlooked
- Overly
- Overlying
- Overmastering
- Overmighty
- Overmodest
- Overmotivated
- Overmuch
- Overmuscled
- Overneat
- Overnew
- Overnice
- Overnight
- Overnighter
- Overoptimistic
- Overpessimistic
- Overplayful
- Over-polite
- Overpriced
- Overproof
- Overproud
- Overqualified
- Overraced
- Overracked
- Overrank
- Overrash
- Over-rated
- Overreaching
- Overreactive
- Over-reactive
- Overread
- Overready
- Overrefined
- Overriding
- Overripe
- Over-ripe
- Oversea
- Overseas
- Oversensitive
- Over-sensitive
- Overserious
- Oversewn
- Oversexed
- Overshot
- Oversimplistic
- Oversize
- Oversized
- Overslow
- Oversmoothed
- Oversnowed
- Oversocialized
- Oversoft
- Oversolar
- Oversolicitous
- Oversophisticated
- Oversparred
- Overspecific
- Overspeeding
- Overstated
- Oversteered
- Overstimulated
- Overstrung
- Overstuffed
- Oversubscribed
- Oversuspicious
- Overt
- Over-the-counter
- Over-the-top
- Overtight
- Overtired
- Overtouristed
- Overtroubled
- Overtrusting
- Overturnable
- Overturned
- Overuniform
- Overvaliant
- Overwater
- Overweening
- Overweight
- Overwhelmed
- Overwhelming
- Overwrought
- Overzealous
- Over-zealous
- Ovid
- Oviform
- Ovigerous
- Oviparous
- Ovular
- Ovulational
Adjectives that Start with Ow, Ox
- Ower
- Owing
- Owlish
- Own
- Owned
- Ownerless
- Oxalic
- Oxblood
- Oxeyed
- Ox-eyed
- Oxonian
- Oxyacetic
- Oxygenic
- Oxyntic
- Oxytocic
Adjectives that Start with Oy, Oz
- Oyster
- Oysterish
- Oysterless
- Oysterlike
- Oystery
- Ozone-friendly
Adjectives Starting with O | Image
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