English for Students

GRE Word List-O

This is a Complete List of GRE Word List-O.

oaf: stupid awkward person
oath :solemn promise; blasphemous use of sacred words to express strong feelings; swear-word
oatmeal :crushed oats used for making porridge
obdurate :stubborn; refusing to change one’s belief
obeisance: bow (to show respect and obedience)
obelisk :tall column tapering(becoming gradually narrower toward the end) and ending in a pyramid
obese :excessively fat
obfuscate: confuse; muddle; cause confusion; make needlessly complex; make so confused as to be difficult to understand
obituary :death notice (esp. in a newspaper)
objective: not influenced by emotions; fair
obligatory :binding; required; compulsory
oblige: constrain; make grateful; do a favor; accommodate
oblique: indirect; slanting (deviating from the perpendicular or from a straight line)
obliterate :destroy completely; wipe out
oblivion: obscurity; condition of being completely forgotten; forgetfulness
oblivious: inattentive or unmindful; unaware; wholly absorbed; forgetful(having the habit of forgetting)
obloquy :slander; disgrace; infamy
obnoxious :offensive; disagreeable
obscure: dark; vague; unclear; not well known
obsequious: slavishly attentive; servile; full of servile compliance; sycophantic
obsequy: funeral ceremony
obsessive :related to thinking about something constantly; of an obsession; preoccupying
Obsession : compulsive preoccupation with a fixed idea; compulsive idea
obsess : preoccupy the mind of excessively
obsidian :black volcanic rock
obsolete: outmoded; no longer used
obstetrician :physician specializing in delivery(assisting in giving birth) of babies
obstinate: stubborn; hard to control or treat
obstreperous: boisterous; noisy and uncontrollable
obtrude :push (oneself or one’s ideas) forward or intrude; impose (oneself or one’s ideas) on others; butt in
obtuse: blunt; not sharp; stupid; slow in understanding
obviate: make unnecessary; get rid of
Occident: the West
occlude: shut; close; obstruct
Occult :mysterious; secret; supernatural; beyond human comprehension
oculist :physician who specializes in treatment of the eyes
odds :chances; probability; disagreement
odious: arousing strong dislike; hateful(causing hatred); vile
odium: detestation; quality of being odious; hatefulness; disrepute (resulting from hateful conduct)
odoriferous: giving off an odor
odorous: having an odor
odyssey: long, eventful, adventurous journey
offensive: attacking; insulting; distasteful
offend: violate; hurt the feelings of
offense : offending; violating of a moral or social code; crime; attack
offhand :casual; done without prior thought or preparation
officious: meddlesome; excessively pushy in offering one’s services; overly eager in offering unwanted services
ogle: look at amorously; make eyes at
olfactory: concerning the sense of smell
oligarchy: government by a privileged few
ominous :threatening; of an evil omen
omnipotent :all-powerful; having unlimited power
omnipresent: universally present; ubiquitous
omniscient: all-knowing
omnivorous :eating both plant and animal food; devouring everything
onerous :burdensome

onomatopoeia: words formed in imitation of natural sounds
onslaught :vicious assault; fierce attack
onus: burden; responsibility
ooze: (of a thick liquid) pass or flow slowly
opalescent: iridescent; lustrous; like an opal
opaque :dark; not transparent
opiate :medicine to induce sleep or deaden pain; something that relieves emotions or causes inaction; sleep-producing drug containing opium
opportune: timely; well-chosen
opportunist: individual who sacrifices principles for expediency by taking advantage of circumstances
opprobrium :infamy; disgrace arising from shameful conduct; vilification(slander); scorn; contempt
Opprobrious: expressing contempt; shameful or infamous
optician: maker and seller of eyeglasses
optimist : person who looks on the bright side
optimum : most favorable; optimal
optional: not compulsory; left to one’s choice
Option: act of choosing; choice; freedom or power to choose
optometrist :one who fits glasses to remedy visual defects
opulence: extreme wealth; luxuriousness; abundance
opulent: possessing great wealth; abundant
opus :work (esp. musical composition)
oracular :of an oracle; prophetic; uttered as if with divine authority; mysterious or ambiguous; hard to understand
orator :public speaker
oratorio :dramatic poem set to music; long musical work with singing but without acting
ordain :decree or command; grant holy orders; predestine; install as a minister, priest, or rabbi
ordeal :severe trial or affliction; difficult experience; trial(test of patience or endurance); affliction
ordinance :decree; authoritative order
ordination :ceremony conferring holy orders; ceremony of ordaining a priest
orgy :wild drunken revelry; unrestrained indulgence in an activity
orient :get one’s bearings; adjust; make familiar with a situation; orientate
orientation :act of finding oneself in society; orienting
orifice :mouth like opening; small opening (esp. to a cavern or passage of the body)
ornate :excessively or elaborately decorated
ornithologist :scientific student of birds
ornithology: scientific study of birds
orthodox :traditional; (of someone) conservative in belief; adhering to an established doctrine
orthography: correct spelling
oscillate :vibrate pendulum like; waver
osseous :made of bone; bony
ossify :change or harden into bone; become hard and unchanging in one’s ideas
ostensible :apparent; appearing as such; professed(pretended); pretended
ostentatious :showy; trying to attract attention; pretentious
ostracize :banish from a group; exclude from public favor; ban
oust expel :drive out; force out
outcast :one that has been excluded from a society
outfit :clothing or equipment for a special purpose
outgoing :sociable; eager to mix socially with others
outlandish :bizarre; peculiar; unconventional
outlaw :fugitive from the law (excluded from legal protection)
outlook: point of view; view from a particular place; expectation for the future; prospect
outmoded: no longer in fashion or use; no longer stylish; old-fashioned
outrage :act of extreme violence or viciousness; resentful anger
outrageous: offensive
outskirts: fringes; outer borders (as of a city)
outspoken :candid; blunt
outstrip :outrun; surpass; outdo
outwit: outsmart; defeat by behaving more cleverly
ovation :enthusiastic applause
overbearing :bossy; domineering and arrogant; decisively important
overbear: dominate
overblown: inflated; exaggerated
oversee :watch over and direct; supervise
overt :open to view; public; not secret
overthrow :topple
overture: musical introduction to a long musical piece; first offer or proposal (to begin talks in the hope of reaching an agreement)
overturn :turn over; capsize; topple
overweening :arrogant; presumptuous
overwhelm : (of water) cover completely; defeat completely by much greater force
overwrought :nervous or excited; extremely agitated; hysterical; wrought-up
ovoid :egg-shaped

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