imply make a suggestion
impromptu without preparation
impudence being rash, indisreet
impugned challenged, to be doubted
inasmuch since, because
inchoate just begun, half-form state
incise engrave, make a cut in
incite stir up, rouse
inclined directing the mind in a certain direction
incoherently not consistently, unclearly
incongruous out of place, not in harmony or agreement
incorrigibility cannot be cured or corrected
incumbents official duties
incursion sudden attack
indelible that cannot be rubbed out
indigence poverty
indigenous native
indistinct not easily heard, seen, clearly marked
inept unskillful; said or done at the wrong time
infertile not fertile, barren
infertility being not fertile
infuse put, pour, fill
inhibit hinder, restrain
innocuous causing no harm
insipid without taste or flavour
insularity being narrow-minded
intersperse place here and there
intransigent uncompromising
introspection examining one's own thoughts and feelings
invective abusive language, curses
inveigle trick by using flattery, deception
inveterate deep-rooted. long-established
irate angry
ire anger
irksome tiresome
irrelevant not relevant, not connected
irrevocable final and unalterable
itinerary plan for a journey, details or records of a route
jabber talk excitedly; utter rapidly
lackluster (of eyes) dull
lag go too slow
latent present but not yet active, developed or visible
laudatory expressing or giving praise
lavish giving or producing freely, liberally or generously
leakage the process of leaking
lien legal claim until a debt on it is repaid
limp lacking strength, walking unevenly
loll rest, to sit or stand in a lazy way; hang (dog's tongue)
loquacious talkative
lubricant substance that makes work easier
lubricate put oil to make work easily
lugubrious dismal, mourful;
lull become quiet or less active
luminary star, light-giving body
macabre gruesome, suggesting death
maladroit tactless, clumpsy
malapropism misuse of a word (for one that resembles it)
malign injurious, speak ill of smb, tell lie
martial brave, of associated with war
massacre cruel killing of a large number of people
matriculation be admitted, enter a university as a student
mature come to full development, to a state ready for use
mendacious false
mercurial lively, quick-witted; inconsistent, changeable
meretricious attractive on the surface but of little value
mischievous harmful, causing mischief
miser person who loves wealth and spends little
missile smth that is thrown or shot
moderation quality of being limited, not extreme
mollify make calmer or quiter
molt moult, lose hair, feathers before new growing
morbid diseased, unhealthy (eg. about ideas)
morose ill-tempered, unsocial
mortuary place where dead bodies are taken to be kept until burial
mundane wordly, ordinary, dull
negligent taking too little care
noisome offensive, disgusting (smell)
nonplussed greatly surprised
noxious harmful
numb without ability to feel or move
numbness without ability to move a finger
obdurate stubborn, impenitent
obsequious too eager to obey or serve
officious too eager or ready to help, offer advice
opprobrious showing scorn or reproach
ostentation display to obtain admiration or envy
ostentatious fond of
ostracism shut out from society, refuse to meet, talk
ostrich fast-running bird unable to fly
outset start
overhaul examine thoroughly to learn about the condition
overwhelm weigh down, submerge
palpability can be felt, touched, understood
palpitate tremble, beat rapidly and irregularly
parenthesis sentense within another one, smth separated
parsimonious too economical, miserly
peccadillo small sin; small weakness in one's character
penchant taste, liking, inclination
penury poverty
peremptory not to be disobeyed or questioned
perennial lasting for a long time (eg. a year) GRE考试形式：中国大陆地区、香港、澳门、韩国目前执行分开考试的形式。由机考（分析性写作）和笔试（语文、数学）组成。
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