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100 terms

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oaf
stupid awkward person; CF. elf
obdurate
stubborn; refusing to change one's belief
obeisance
bow
obelisk
tall column tapering and ending in a pyramid
obese
excessively fat; N. obesity
obfuscate
confuse; muddle; cause confusion; make needlessly complex; make so confused as to be difficult to understand
obituary
death notice ; ADJ.
objective
not influenced by emotions; fair; N: goal; aim
obligatory
binding; required; compulsory; V. oblige: constrain; make grateful; do a favor; accommodate
oblique
indirect; slanting ; Ex. oblique reference
obliterate
destroy completely; wipe out; Ex. obliterate the village
oblivion
obscurity; condition of being completely forgotten; forgetfulness
oblivious
inattentive or unmindful; unaware; wholly absorbed; forgetful
obloquy
slander; disgrace; infamy
obnoxious
offensive; disagreeable; Ex. obnoxious smell
obscure
dark; vague; unclear; not well known; Ex. obscure meaning/village; V: darken; cover; make unclear; Ex. obscure the moon/meaning
obsequious
slavishly attentive; servile; full of servile compliance; sycophantic
obsequy
funeral ceremony
obsessive
related to thinking about something constantly; of an obsession; preoccupying; N. obsession: compulsive preoccupation with a fixed idea; compulsive idea; V. obsess: preoccupy the mind of excessively
obsidian
black volcanic rock
obsolete
outmoded; no longer used
obstetrician
physician specializing in delivery of babies; N. obstetrics; CF. midwife
obstinate
stubborn; hard to control or treat; Ex. obstinate cough; N. obstinacy
obstreperous
boisterous; noisy and uncontrollable
obtrude
push forward or intrude; impose on others; butt in; stick out or extrude; thrust out; Ex. obtrude A on B; ADJ. obtrusive; N. obtrusion; CF. unobtrusive
obtuse
blunt; not sharp; stupid; slow in understanding
obviate
make unnecessary; get rid of; Ex. obviate the need
Occident
the West
occlude
shut; close; obstruct; Ex. A blood clot occluded an artery.
occult
mysterious; secret; supernatural; beyond human comprehension; CF. mysterious to human ?; OP. bare
oculist
physician who specializes in treatment of the eyes
odious
arousing strong dislike; hateful; vile
odium
detestation; quality of being odious; hatefulness; disrepute
odoriferous
giving off an odor
odorous
having an odor
odyssey
long, eventful, adventurous journey
offensive
attacking; insulting; distasteful; V. offend: violate; hurt the feelings of; N. offense: offending; violating of a moral or social code; crime; attack; Ex. first offense
offhand
casual; done without prior thought or preparation
officious
meddlesome; excessively pushy in offering one's services; overly eager in offering unwanted services or advices; Ex. officious bellboy
ogle
look at amorously; make eyes at; Ex. old men ogling young girls
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; Ex. unexpected onslaught of the enemy
onus
burden; responsibility
opalescent
iridescent; lustrous; like an opal; N. opalescence
opaque
dark; not transparent; N. opacity
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; N. opportunism
opprobrium
infamy; disgrace arising from shameful conduct; vilification; scorn; contempt; Ex. opprobrium hurled against him; ADJ. opprobrious: expressing contempt; shameful or infamous
optician
maker and seller of eyeglasses
optimist
person who looks on the bright side; N. optimism
optimum
most favorable; optimal; N: most favorable condition
optional
not compulsory; left to one's choice; N. option: act of choosing; choice; freedom or power to choose; something available as a choice; Ex. have no option; Ex. two options
optometrist
one who fits glasses to remedy visual defects
opulence
extreme wealth; luxuriousness; abundance; ADJ. opulent: possessing great wealth; abundant
opus
work ; Ex. magnum opus: masterpiece; CF. opera
oracular
of an oracle; prophetic; uttered as if with divine authority; mysterious or ambiguous; hard to understand; N. oracle: wiser person; prophecy made by an oracle
orator
public speaker
oratorio
dramatic poem set to music; long musical work with singing but without acting; CF. cantata
ordain
decree or command; grant holy orders; predestine; install as a minister, priest, or rabbi; N. ordainment; CF. ordination
ordeal
severe trial or affliction; difficult experience; trial; affliction
ordinance
decree; authoritative order
ordination
ceremony conferring holy orders; ceremony of ordaining a priest
orgy
wild drunken revelry; unrestrained indulgence in an activity; Ex. orgy of shopping
orient
get one's bearings; adjust; make familiar with a situation; orientate
orientation
act of finding oneself in society; orienting
orifice
mouthlike opening; small opening ; CF. mouth
ornate
excessively or elaborately decorated
ornithologist
scientific student of birds; N. ornithology: scientific study of birds
orthodox
traditional; conservative in belief; adhering to an established doctrine
orthography
correct spelling; CF. ortho-: straight; correct; Ex. orthodontics
oscillate
vibrate pendulumlike; 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; Ex. ostensible purpose of the expedition
ostentatious
showy; trying to attract attention; pretentious; N. ostentation: showy display
ostracize
banish from a group; exclude from public favor; ban; Ex. His friends ostracized him. N. ostracism
oust
expel; drive out; force out; N. ouster: ousting
outlandish
bizarre; peculiar; unconventional
outmoded
no longer in fashion or use; no longer stylish; old-fashioned
outrage
act of extreme violence or viciousness; resentful anger; V: commit an outrage on; produce anger in; ADJ. outrageous: offensive
outskirts
fringes; outer borders ; Ex. outskirts of Boston
outspoken
candid; blunt
outstrip
outrun; surpass; outdo
outwit
outsmart; defeat by behaving more cleverly
ovation
enthusiastic applause
overbearing
bossy; domineering and arrogant; decisively important; Ex. overbearing manner/importance; V. overbear: dominate
overblown
inflated; exaggerated
overt
open to view; public; not secret; CF. covert
overweening
arrogant; presumptuous
overwrought
nervous or excited; extremely agitated; hysterical; wrought-up; CF. wrought: made or done
ovoid
egg-shaped; CF. ovum; CF. ovulate