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GRE word list - O
oafish a stupid person:BOOB
oasis a fertile or green area in an arid region (as a desert)
obdurate resistant to persuasion or softening influences
obedient submissive to the restraint or command of authority:willing to obey
obeisance 1. a movement of the body made in token of respect or submission:BOW 2. a movement of the body made in token of respect or submission:BOW
obfuscate to make obscure
obituary a notice of a person's death usually with a short biographical account
obligatory binding in law or conscience
oblige to do a favor for
obliging willing to do favors:ACCOMMODATING
oblique not straightforward:INDIRECT; also :OBSCURE
obliterate to remove from existence:destroy utterly all trace, indication, or significance of
oblivious lacking remembrance, memory, or mindful attention
obloquy Abusively detractive language or utterance; calumny
obscure not clearly seen or easily distinguished:FAINT
obsequious marked by or exhibiting a fawning attentiveness
observatory a building or place given over to or equipped for observation of natural phenomena (as in astronomy);
obsess to haunt or excessively preoccupy the mind of
obsolete of a kind or style no longer current
obstacle something that impedes progress or achievement
obstinate adj. perversely adhering to an opinion, purpose, or course in spite of reason, arguments, or persuasion
obstreperous marked by unruly or aggressive noisiness:CLAMOROUS
obstruct to hinder from passage, action, or operation
obtuse lacking sharpness or quickness of sensibility or intellect
obviate to anticipate and prevent (as a situation) or make unnecessary (as an action)
occlude to close up or block off:OBSTRUCT
occult not easily apprehended or understood:ABSTRUSE, MYSTERIOUS
occurrence something that occurs
ode a lyric poem usually marked by exaltation of feeling and style, varying length of line, and complexity of stanza forms
odious exciting or deserving hatred or repugnance
offbeat eccentric, unconventional
offend to cause dislike, anger, or vexation
offhand without premeditation or preparation:EXTEMPORE
officious volunteering one's services where they are neither asked nor needed:MEDDLESOME
offish somewhat cold and reserved:STANDOFFISH
ominous being or exhibiting an omen : PORTENTOUS; especially : foreboding or foreshowing evil : INAUSPICIOUS
omniscient having infinite awareness, understanding, and insight
opaque exhibiting opacity:blocking the passage of radiant energy and especially light
opera a drama set to music and made up of vocal pieces with orchestral accompaniment and orchestral overtures and interludes; specifically :GRAND OPERA
opine to express opinions
opportune suitable or convenient for a particular occurrence
oppose to place over against something so as to provide resistance, counterbalance, or contrast
oppression unjust or cruel exercise of authority or power
opprobrious expressive of opprobrium:SCURRILOUS
optimization an act, process, or methodology of making something (as a design, system, or decision) as fully perfect, functional, or effective as possible;
opulent amply or plentifully provided or fashioned often to the point of ostentation
oracle a person (as a priestess of ancient Greece) through whom a deity is believed to speak
oration an elaborate discourse delivered in a formal and dignified manner
orchestra a group of musicians including especially string players organized to perform ensemble music
orient get one's bearings; adjust
original not secondary, derivative, or imitative
ornithology a branch of zoology dealing with birds
orthodoxy the quality or state of being conforming to established doctrine especially in religion
oscillate to swing backward and forward like a pendulum
ossify to become hardened or conventional and opposed to change
ossilate
ostentatious marked by or fond of conspicuous or vainglorious and sometimes pretentious display
ostracism exclusion by general consent from common privileges or social acceptance
oust to remove from or dispossess of property or position by legal action, by force, or by the compulsion of necessity
outgoing openly friendly and responsive:EXTROVERTED
outmaneuver to maneuver with better effect than; outwit
outmoded no longer acceptable, current, or usable
outwit to get the better of by superior cleverness:OUTSMART
overbearing harshly and haughtily arrogant
overdose too great a dose (as of a therapeutic agent)
overexposure to expose excessively; especially:to expose (as film) to excessive radiation (as light)
overlap to occupy the same area in part:lap over
oversee INSPECT, EXAMINE
overt open to view:MANIFEST
overture something introductory:PRELUDE
overwhelm to make helpless, as with greater force or deep emotion; overcome; crush; overpower
overwrought extremely excited:AGITATED
oxymoron a combination of contradictory or incongruous words

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