Adjectives that Start with O! In this section, you will learn a list of common words that start with O in English with ESL picture and example sentences to help you enhance your vocabulary words.
Table of Contents
Adjectives that Start with O
- Oafish
- Oaken
- Oaten
- Obdurate
- Obedient
- Obese
- Objectionable
- Objective
- Oblanceolate
- Oblate
- Obligate
- Obligated
- Obligational
- Obligatory
- Obliging
- Oblique
- Obliterable
- Obliterate
- Obliterated
- Oblivious
- Oblong
- Obnoxious
- Obovate
- Obscene
- Obscure
- Obsequious
- Observable
- Observant
- Observational
- Observing
- Obsessional
- Obsessive
- Obsolescent
- Obsolete
- Obstetric
- Obstetrical
- Obstinate
- Obstreperous
- Obstructed
- Obstructive
- Obtainable
- Obtrusive
- Obtuse
- Obvious
- Occasional
- Occidental
- Occipital
- Occluded
- Occlusive
- Occult
- Occupational
- Occupied
- Occurrent
- Oceangoing
- Oceanic
- Ocellated
- Ocher
- Ochre
- Octagonal
- Octal
- Octangular
- Octogenarian
- Octosyllabic
- Octuple
- Ocular
- Odd
- Oddish
- Odiferous
- Odious
- Odoriferous
- Odorless
- Odorous
- Odourless
- Oecumenic
- Oecumenical
- Off
- Offbeat
- Offended
- Offenseless
- Offensive
- Offhand
- Offhanded
- Official
- Officious
- Offish
- Offshore
- Offside
- Offstage
- Ohmic
- Oily
- OK
- Old
- Olden
- Old-fashioned
- Oldish
- Oldline
- Oleaceous
- Oleaginous
- Oleophilic
- Oleophobic
- Olfactive
- Olfactory
- Oligarchic
- Olive
- Olivelike
- Olympian
- Olympic
- Omani
- Ominous
- Omissible
- Omissive
- Omnibus
- Omnidirectional
- Omnifarious
- Omnipotent
- Omnipresent
- Omniscient
- Omnivorous
- Oncologic
- Oncoming
- One
- Oneiric
- Onerous
- Onetime
- Ongoing
- Online
- Only
- Onomastic
- Onshore
- Onside
- Onstage
- Ontogenetic
- Ontological
- Onymous
- Oozy
- Opalescent
- Opaline
- Opaque
- Open
- Opencast
- Opencut
- Openhanded
- Open-handed
- Openhearted
- Open-hearted
- Opening
- Open-minded
- Openmouthed
- Operable
- Operant
- Operatic
- Operating
- Operational
- Operative
- Operculate
- Operculated
- Operose
- Ophthalmic
- Opinionated
- Opinionative
- Opponent
- Opportune
- Opportunistic
- Opposable
- Opposed
- Opposing
- Opposite
- Oppositive
- Oppressive
- Opprobrious
- Optative
- Optic
- Optical
- Optimal
- Optimistic
- Optimum
- Optional
- Opulent
- Oracular
- Oral
- Orange
- Orangish
- Oratorical
- Orbicular
- Orbiculate
- Orbital
- Orbitual
- Orchestral
- Ordained
- Ordered
- Orderly
- Ordinal
- Ordinary
- Organic
- Organicistic
- Organisational
- Organised
- Organismal
- Organismic
- Organizational
- Organized
- Orgiastic
- Oriental
- Orientated
- Oriented
- Original
- Originative
- Ornamental
- Ornate
- Ornery
- Ornithological
- Oropharyngeal
- Orotund
- Orphaned
- Orphic
- Orthodox
- Orthogonal
- Orthom*olecular
- Orthopaedic
- Orthopedic
- Orthopedical
- Orthoptic
- Orthostatic
- Orthotropous
- Orwellian
- Oscine
- Oscitant
- Osseous
- Ossicular
- Ossiculate
- Ossiferous
- Ossified
- Osteal
- Ostensible
- Ostensive
- Ostentatious
- Other
- Otherwise
- Otherworldly
- Otic
- Otiose
- Ototoxic
- Ottoman
- Outback
- Outboard
- Outbound
- Outbred
- Outcast
- Outcaste
- Outclassed
- Outdated
- Outdoor
- Outer
- Outermost
- Outflowing
- Outgoing
- Outlandish
- Outlaw
- Outlawed
- Outlying
- Outmoded
- Outmost
- Outraged
- Outrageous
- Outre
- Outrigged
- Outright
- Outside
- Outsized
- Outspoken
- Outspread
- Outstanding
- Outstretched
- Outward
- Oval
- Ovarian
- Ovate
- Over
- Overabundant
- Overactive
- Overaged
- Overaggressive
- Overall
- Overambitious
- Overanxious
- Overarm
- Overbearing
- Overblown
- Overbold
- Overburdened
- Overbusy
- Overcareful
- Overcast
- Overcautious
- Overconfident
- Overcooked
- Overcredulous
- Overcritical
- Overcrowded
- Overcurious
- Overdelicate
- Overdressed
- Overdue
- Overemotional
- Overenthusiastic
- Overexcited
- Overfamiliar
- Overfed
- Overfond
- Overfull
- Overgenerous
- Overgreedy
- Overgrown
- Overhand
- Overhanded
- Overhasty
- Overhead
- Overheated
- Overindulgent
- Overjealous
- Overjoyed
- Overladen
- Overland
- Overlarge
- Overlying
- Overmodest
- Overmuch
- Overnice
- Overnight
- Overoptimistic
- Overpowering
- Overpriced
- Overprotective
- Overproud
- Overqualified
- Overrated
- Overrefined
- Overripe
- Oversea
- Overseas
- Oversensitive
- Overserious
- Oversewn
- Oversexed
- Overshot
- Oversize
- Oversized
- Oversolicitous
- Overstrung
- Overstuffed
- Oversubscribed
- Oversuspicious
- Overt
- Overweening
- Overweight
- Overwhelmed
- Overwhelming
- Overworked
- Overwrought
- Overzealous
- Oviform
- Ovine
- Oviparous
- Ovoid
- Ovoviviparous
- Owing
- Owlish
- Own
- Owned
- Ownerless
- Oxidative
- Oxidised
- Oxidizable
- Obeisant
- Obsessed
- Obstruent
- Occlusal
- Odd-looking
- Oddball
- Off-key
- Off-kilter
- Officiary
- Offline
- Ogreish
- Okay
- Old hat
- Old-school
- Old-world
- Older
- Oldest
- Oncological
- One-legged
- One-sided
- Overassertive
- Overvaliant
- Obliged
- Observed
- Obviating
- Offenceless
- Offending
- Offsides
- Opened
- Operationalist
- Opportunist
- Oppressed
- Orchestrated
- Orientating
- Orienting
- Orthodontic
- Orthographic
- Oscillating
- Oscillatory
- Osmotic
- Outdoorsy
- Outfitted
- Outlined
- Outsize
- Overage
- Overawed
- Overdone
- Overeager
- Overflowing
- Overloaded
- Overlooked
- Overreaching
- Overriding
- Overstated
- Overturned
- Ovular
- Oxalic
Adjectives that Start with O to Describe a Person
- Observant – quick to notice things and pay attention to details
- Optimistic – having a positive outlook on life and expecting good things to happen
- Outgoing – friendly, sociable, and extroverted
- Open-minded – willing to consider different viewpoints and ideas
- Organized – having a structured and orderly approach to tasks and activities
- Original – unique and creative, not derivative or copied from others
- Objective – impartial and unbiased, not influenced by personal feelings or opinions
- Obliging – willing to help and be of service to others
- Outstanding – exceptional and impressive, standing out from others in a positive way
- Observational – keenly aware and perceptive, often associated with writers or artists
- Obsequious – overly eager to please and overly deferential to authority figures
- Overconfident – excessively self-assured and confident, often to the point of arrogance
- Opinionated – holding strong and often inflexible opinions, often at the expense of considering other viewpoints
- Overbearing – domineering and controlling, often in an oppressive or unpleasant way
- Obedient – willing to follow rules and authority without question
- Offensive – causing offense or hurt feelings, often due to insensitive or inappropriate behavior
- Ostentatious – showy and attention-seeking, often associated with excessive wealth or status
- Overprotective – excessively concerned with the safety and well-being of others, often to the point of being overbearing
- Outspoken – frank and direct in expressing opinions and ideas, often without concern for social conventions or politeness
- Overwhelmed – feeling overwhelmed or stressed by a situation or task that seems too difficult to handle.
Adjectives that Start with O to Describe Food
- Organic – grown without the use of pesticides or other chemicals
- Oily – containing a high amount of oil or fat
- Overcooked – cooked for too long, resulting in a dry or tough texture
- Overripe – too ripe, often resulting in a mushy or unappetizing texture
- Oven-baked – cooked in an oven, often resulting in a crispy or browned texture
- Odorous – having a strong or unpleasant smell
- On-the-go – designed for easy consumption while on the move, often used to describe snacks or convenience foods
- Outrageous – unusually large or excessive in size, often used to describe portions or servings
- Overwhelming – having a strong or intense flavor, often used to describe spices or seasonings
- Organic-certified – meeting the strict standards for organic certification, often used to describe produce or dairy products
- Off-flavor – having an unpleasant or unusual flavor, often due to spoilage or contamination
- Oven-roasted – cooked in an oven, often resulting in a tender and flavorful texture
- Open-flame-grilled – cooked over an open flame, often resulting in a smoky and charred flavor
- Organic-fed – raised on organic feed, often used to describe meat or poultry products
- Oven-ready – prepared and ready to be cooked in an oven, often used to describe pre-packaged meals or ingredients
- Oozing – having a soft and melting texture, often used to describe cheese or chocolate
Adjectives that Start with O to Describe a Place
- Open – not enclosed or blocked, often associated with spaciousness and freedom
- Old-fashioned – traditional or classic in style or design, often associated with historical or cultural significance
- Ornate – highly decorated or embellished, often associated with grandeur and luxury
- Oceanfront – located along the ocean, often associated with scenic views and waterfront activities
- Overcrowded – having too many people or objects in a limited space, often associated with congestion and discomfort
- Off-the-beaten-path – located in a less-traveled or less-frequented area, often associated with hidden gems and unique experiences
- Opaque – not transparent or clear, often associated with mystery and obscurity
- Outdoor – located outside, often associated with nature and outdoor activities
- Open-air – not enclosed or covered, often associated with fresh air and natural light
- Overgrown – covered or filled with overgrown vegetation, often associated with neglect and abandonment
- Outlying – located far from the center or main area, often associated with rural or remote areas
- Overlooking – situated above and with a view of, often associated with scenic views and privacy
- Overwhelming – having a powerful and intense impact, often associated with awe and amazement
- Old-world – traditional or classic in style or design, often associated with historical or cultural significance
- Opulent – luxurious and grand, often associated with wealth and extravagance
- Outdoorsy – suited to outdoor activities and pursuits, often associated with adventure and exploration
- Organic – free from artificial additives or chemicals, often associated with natural and healthy living
- Open-plan – lacking walls or partitions, often associated with modern and flexible living spaces
- Orderly – neat and well-organized, often associated with efficiency and professionalism
- Oasis-like – resembling an oasis, often associated with a peaceful and refreshing environment.
Adjectives that Start with O to Describe Feelings and Emotions
- Optimistic – having a positive outlook on life and expecting good things to happen
- Overwhelmed – feeling overwhelmed or stressed by a situation or task that seems too difficult to handle
- Offended – feeling hurt or insulted by someone’s words or actions
- Overjoyed – extremely happy and joyful
- Outraged – feeling angry or indignant about something that is perceived as unjust or wrong
- Obliged – feeling a sense of duty or responsibility towards someone or something
- Overcome – feeling overwhelmed or defeated by something, often associated with a sense of powerlessness
- Obsessed – having an intense and consuming preoccupation with something, often to the point of being unhealthy
- Open-hearted – being open and sincere in expressing emotions and feelings, often associated with warmth and generosity
- Over-sensitive – easily hurt or offended by criticism or negative feedback
Adjectives that Start with O with Examples
- Obvious – It was obvious that he was lying.
- Obedient – The obedient dog always followed its owner’s commands.
- Odd – That’s an odd way to do things.
- Old – The old man lived alone in a small house.
- Open – The open window let in a cool breeze.
- Optimistic – She had an optimistic outlook on life.
- Original – The painting was an original by a famous artist.
- Outrageous – The price of the car was outrageous.
- Outstanding – His performance was outstanding and he received a standing ovation.
- Overwhelming – The amount of work was overwhelming.
- Ordinary – The food was just ordinary, nothing special.
- Organic – The organic vegetables were grown without pesticides.
- Ornate – The ornate decoration on the building was beautiful.
- Opaque – The glass was opaque and you couldn’t see through it.
- Onerous – The task of cleaning the entire house was onerous.
- Offensive – His comments were offensive and hurtful.
- Observant – The observant detective noticed a clue that others had missed.
- Open-minded – She was open-minded and willing to consider different viewpoints.
- Opportunistic – The politician was accused of being opportunistic and only interested in gaining power.
- Overdue – The bill was overdue and needed to be paid immediately.
Learn more with words that start with O in English.
Adjectives that Start with O Infographic
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