400+ Adjectives that Start with O with Useful Examples

The following articles provides the list of adjectives that start with O in English with example sentences and ESL infographic. This list is an excellent starting point for building up vocabulary to converse fluently in English.

Adjectives that Start with O

List of 400+ Adjectives that Begin with O

  • Oafish
  • Oaken
  • Oaten
  • Obdurate
  • Obedient
  • Obese
  • Objectionable
  • Objective
  • Oblanceolate
  • Oblate
  • Obligate
  • Obligated
  • Obligational
  • Obligatory
  • Obliged
  • Obliging
  • Oblique
  • Obliterable
  • Obliterate
  • Obliterated
  • Oblivious
  • Oblong
  • Obnoxious
  • Obovate
  • Obscene
  • Obscure
  • Obsequious
  • Observable
  • Observant
  • Observational
  • Observed
  • Observing
  • Obsessed
  • Obsessional
  • Obsessive
  • Obsolescent
  • Obsolete
  • Obstetric
  • Obstetrical
  • Obstinate
  • Obstreperous
  • Obstructed
  • Obstructive
  • Obtainable
  • Obtrusive
  • Obtuse
  • Obviating
  • Obvious
  • Occasional
  • Occidental
  • Occipital
  • Occluded
  • Occlusive
  • Occult
  • Occupational
  • Occupied
  • Occurrent
  • Oceangoing
  • Oceanic
  • Ocellated
  • Ocher
  • Ochre
  • Octagonal
  • Octal
  • Octangular
  • Octogenarian
  • Octosyllabic
  • Octuple
  • Ocular
  • Odd
  • Oddish
  • Odd-looking
  • Odiferous
  • Odious
  • Odoriferous
  • Odorless
  • Odorous
  • Odourless
  • Oecumenic
  • Oecumenical
  • Off
  • Offbeat
  • Offenceless
  • Offended
  • Offending
  • Offenseless
  • Offensive
  • Offhand
  • Offhanded
  • Official
  • Officious
  • Offish
  • Offshore
  • Offside
  • Offsides
  • Offstage
  • Ohmic
  • Oiled
  • Oily
  • Ok
  • Okay
  • Old
  • Olden
  • Older
  • Oldest
  • Old-fashioned
  • Oldish
  • Oldline
  • Oleaceous
  • Oleaginous
  • Oleophilic
  • Oleophobic
  • Olfactive
  • Olfactory
  • Oligarchic
  • Oligarchical
  • Olive
  • Olivelike
  • Olympian
  • Olympic
  • Omani
  • Ominous
  • Omissible
  • Omissive
  • Omnibus
  • Omnidirectional
  • Omnifarious
  • Omnipotent
  • Omnipresent
  • Omniscient
  • Omnivorous
  • On
  • Oncologic
  • Oncological
  • Oncoming
  • One
  • One-hour
  • Oneiric
  • Onerous
  • One-sided
  • Onetime
  • Ongoing
  • Online
  • Only
  • Onomastic
  • Onomatopoeic
  • Onomatopoeical
  • Onomatopoetic
  • Onshore
  • Onside
  • Onstage
  • Ontogenetic
  • Ontological
  • Onymous
  • Oozing
  • Oozy
  • Opalescent
  • Opaline
  • Opaque
  • Open
  • Opencast
  • Opencut
  • Opened
  • Openhanded
  • Openhearted
  • Opening
  • Open-minded
  • Openmouthed
  • Operable
  • Operant
  • Operatic
  • Operating
  • Operational
  • Operationalist
  • Operative
  • Operculate
  • Operculated
  • Operose
  • Ophthalmic
  • Opinionated
  • Opinionative
  • Opisthognathous
  • Opponent
  • Opportune
  • Opportunist
  • Opportunistic
  • Opposable
  • Opposed
  • Opposing
  • Opposite
  • Oppositive
  • Oppressed
  • Oppressive
  • Opprobrious
  • Optative
  • Optic
  • Optical
  • Optimal
  • Optimistic
  • Optimum
  • Optional
  • Opulent
  • Oracular
  • Oral
  • Orange
  • Orangish
  • Oratorical
  • Orbicular
  • Orbiculate
  • Orbital
  • Orbitual
  • Orchestral
  • Orchestrated
  • Ordained
  • Ordered
  • Orderly
  • Ordinal
  • Ordinary
  • Organic
  • Organicistic
  • Organisational
  • Organised
  • Organismal
  • Organismic
  • Organizational
  • Organized
  • Orgiastic
  • Oriental
  • Orientated
  • Orientating
  • Oriented
  • Orienting
  • Original
  • Originative
  • Ornamental
  • Ornate
  • Ornery
  • Ornithological
  • Oropharyngeal
  • Orotund
  • Orphaned
  • Orphic
  • Orthodontic
  • Orthodox
  • Orthogonal
  • Orthographic
  • Orthomolecular
  • Orthopaedic
  • Orthopedic
  • Orthopedical
  • Orthoptic
  • Orthostatic
  • Orthotropous
  • Orwellian
  • Oscillating
  • Oscillatory
  • Oscine
  • Oscitant
  • Osmotic
  • Osseous
  • Ossicular
  • Ossiculate
  • Ossiferous
  • Ossified
  • Osteal
  • Ostensible
  • Ostensive
  • Ostentatious
  • Otc
  • Other
  • Otherwise
  • Otherworldly
  • Otic
  • Otiose
  • Ototoxic
  • Ottoman
  • Our
  • Out
  • Outback
  • Outboard
  • Outbound
  • Outbred
  • Outcast
  • Outcaste
  • Outclassed
  • Outdated
  • Outdoor
  • Outdoorsy
  • Outer
  • Outermost
  • Outfitted
  • Outflowing
  • Outgoing
  • Outlandish
  • Outlaw
  • Outlawed
  • Outlined
  • Outlying
  • Outmoded
  • Outmost
  • Outraged
  • Outrageous
  • Outre
  • Outrigged
  • Outright
  • Outside
  • Outsize
  • Outsized
  • Outspoken
  • Outspread
  • Outstanding
  • Outstretched
  • Outward
  • Oval
  • Ovarian
  • Ovate
  • Over
  • Over sized
  • Overabundant
  • Overactive
  • Overage
  • Overaged
  • Overaggressive
  • Overall
  • Overambitious
  • Overanxious
  • Overarm
  • Over-assertive
  • Overawed
  • Overbearing
  • Overblown
  • Overbold
  • Overburdened
  • Overbusy
  • Overcareful
  • Overcast
  • Overcautious
  • Overconfident
  • Overcooked
  • Overcredulous
  • Overcritical
  • Overcrowded
  • Overcurious
  • Overdelicate
  • Overdone
  • Overdressed
  • Overdue
  • Overeager
  • Overemotional
  • Overenthusiastic
  • Overexcited
  • Overfamiliar
  • Overfed
  • Overflowing
  • Overfond
  • Overfull
  • Overgenerous
  • Overgreedy
  • Overgrown
  • Overhand
  • Overhanded
  • Overhasty
  • Overhead
  • Overheated
  • Overindulgent
  • Overjealous
  • Overjoyed
  • Overladen
  • Overland
  • Overlarge
  • Overloaded
  • Overlooked
  • Overlooking
  • Overlying
  • Overmodest
  • Overmuch
  • Overnice
  • Overnight
  • Overoptimistic
  • Overpowering
  • Overpriced
  • Overprotective
  • Overproud
  • Overqualified
  • Overrated
  • Overreaching
  • Overrefined
  • Overriding
  • Overripe
  • Oversea
  • Overseas
  • Oversensitive
  • Overserious
  • Oversewn
  • Oversexed
  • Overshot
  • Oversize
  • Oversized
  • Oversolicitous
  • Overstated
  • Overstrung
  • Overstuffed
  • Oversubscribed
  • Oversuspicious
  • Overt
  • Overturned
  • Overvaliant
  • Overweening
  • Overweight
  • Overwhelmed
  • Overwhelming
  • Overworked
  • Overwrought
  • Overzealous
  • Oviform
  • Ovine
  • Oviparous
  • Ovoid
  • Ovoviviparous
  • Ovular
  • Owing
  • Owlish
  • Own
  • Owned
  • Ownerless
  • Oxalic
  • Oxidative
  • Oxidised
  • Oxidizable
  • Oxidized

Example Sentences

  • The bodyguards, as usual, were brave but oafish.
  • The ceiling had arched oaken beams.
  • Where does Australian Oaten hay come from?
  • They argued, but he remained obdurate.
  • She is an obedient woman.
  • She is grossly obese.
  • I found the violence in that film really objectionable.
  • It is impossible to be completely objective.
  • The earth is an oblate sphere.
  • It is an obligate parasite with a complex life cycle.
  • We were obligated to attend the opening ceremony.
  • It is obligatory for companies to provide details of their industrial processes.
  • I was obliged to abandon that idea.
  • You’ll find him most obliging.
  • This is an oblique line.
  • She tried to obliterate all memory of her father.
  • The town was obliterated by the bombs.
  • She was oblivious to our warnings.
  • The only bathroom was a tiny oblong.
  • He is the most obnoxious man I know.
  • Bradford made an obscene gesture.
  • The details of his life remain obscure.
  • There’s no observable connection between the two events.
  • You should be observant of the traffic rules.
  • The observational work is carried out on a range of telescopes.
  • The microscope capacitates small objects to be observed.
  • The army was observing a ceasefire.
  • I’m obsessed with one idea.
  • She is obsessional about cleanliness.
  • Some people are obsessive about cleanliness.
  • This type of computer is obsolescent.
  • We’re going to junk these computers, they are obsolete.
  • Key obstetric and fetal outcomes were not significantly different.
  • The main indications of obstetrical hysterectomy were plancta factors and uterine atony.
  • He can be very obstinate at times.
  • He becomes obstreperous when he’s had a few drinks.
  • Tall trees obstructed his view of the road.
  • She’s being downright difficult and obstructive.
  • Our product is obtainable in all computer shop.
  • The factory is an obtrusive eyesore.
  • I’ve really been very obtuse and stupid.
  • It is quite obvious that he is lying.
  • I’ve had occasional mild headaches all my life.
  • My dense Occidental mind did not immediately follow his meaning.
  • The occipital protuberance was well developed.
  • Lymphatics are occluded with fibrin.
  • This confirms poor understanding of the importance of occlusive therapy among parents.
  • He’s interested in witchcraft and the occult.
  • Drivers have to take occupational risks.
  • His time was occupied with the children.
  • Technical terms are rarely occurrent in literature.
  • Several ocean-going ships are being laid down here.
  • Many oceanic islands are volcanic.
  • He was still smiling, but his ocher eyes were serious.
  • I use ultramarine, yellow ochre and crimson.
  • The room is octagonal.
  • The octal tube socket is surface mounted to the breadboard.
  • She is very active for an octogenarian.
  • The ocular micrometer is a circular diameter graticule.
  • Her father was an odd man.
  • The oddish design of the new product worried its producers, but customers seemed to like its originality, and sales were good.
  •  He’s an odd-looking cove.
  • I find his flattery odious.
  • The odoriferous spices stimulated her jaded appetite.
  • Water is not only colorless, but odorless as well.
  • ll the paints are odorous, but we will try our best to reduce the odor.
  • Hydrogen is a corlourless, odourless gas.
  • She’s a little offbeat, but she’s a wonderful actress.
  • Ristarose can also accommodate offbeat locations for ceremonies.
  • She was offended by her husband.
  • I decided to have the offending tooth removed.
  • I found her remarks deeply offensive.
  • He was rather offhand with me.
  • She accused the official of corruption.
  • He’s an officious little man and widely disliked in the company.
  • There are a lot offish and crabs in it.
  • His money is in an offshore island bank.
  • The goal was disallowed for offside.
  • There was a loud crash offstage.
  • The effect of ohmic dissipation on the evolution and saturation of this turbulence is investigated.
  • He had rather oily hands.
  • The old bus started with a jerk.
  • In the olden days the girls were married young.
  • He looks older than he is.
  • The oldest general was appointed marshal of the armies.
  • She wears really old-fashioned clothes!
  • She was oldish – about 60, I’d say.
  • Flours and meals of oil seeds or oleaginous fruits, other than those of mustard.
  • The new oleophobic screen is brighter and displays warmer, richer colors than previous iPhones.
  • This olfactory sense develops in the womb.
  • The oligarchic fortunes are in oil and metals.
  • The skirt she wears is olive.
  • He viewed the world with Olympian detachment.
  • He plans to defend his Olympic crown.
  • Some are descended from Omani tribes.
  • Those black clouds are/look a bit ominous.
  • I enjoy the omnibus edition of Eastenders on Sunday.
  • The causes are omnifarious, continuous consideration and putting forward countermeasures to solve the problems are needed.
  • Nevertheless he was not omnipotent or omniscient, either.
  • These days the media are omnipresent.
  • The novel has an omniscient narrator.
  • She has always been an omnivorous reader.
  • He was one of the founders of oncological research in china.
  • He strayed into the path of an oncoming car.
  • It will quickly shed light on a whole oneiric experience.
  • This is the most onerous task I have ever undertaken.
  • The violence was far from one-sided .
  • There is an ongoing debate on the issue.
  • We planned to build an online database.
  • They’ve only sold thirteen tickets so far.
  • He published a collection of his onomastic essays.
  • Bang and pop are onomatopoeic words.
  • …….

Adjectives Starting with O | Infographic

Adjectives that Start with OPin

Adjectives that Start with OPin

Adjectives that Start with OPin

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j**********************
j**********************
4 months ago

hi?

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