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Glossary of SAT 1 Vocab: I (Ichthyology - Itinerant)

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ichthyology
study of fish
icon
a statue or idol
iconoclast
a rebel; one who breaks with tradition
idealist
one with very high standards
idiosyncrasy
a peculiar personality trait
idolatry
excessive or blind adoration; worship of idols
idyllic
charmingly simple or poetic
igneous
pertaining to fire
ignoble
dishonorable
ignominious
shameful; disgraceful
ignoramus
a stupid person
ilk
type; sort; kind
illicit
unlawful; illegal
illiterate
uneducated
illumine
to brighten; to inspire
illusion
fake impression
illustrious
distinguished; bright
imbibe
to drink; to absorb
imbroglio
a difficult or confusing situation
imbue
to fill completely; to penetrate
immaculate
spotless; pure
imminent
likely to happen; threatening
immolate
to kill someone as a sacrificial victim, usually by fire
immortal
not subject to death
immunity
freedom from disease
immutable
unchangeable
impair
to weaken; to cause to become worse
impale
to pierce with a sharp stake through the body
impalpable
vague; not understandable
impartial
without prejudice
impasse
a dead-end; a problem without a solution
impeach
to accuse
impeccable
flawless; without fault
impecunious
without money
impede
to hinder or obstruct
impediment
a barrier or obstruction
impel
to push into motion; to urge
impending
likely to happen soon
imperative
extremely necessary
imperious
domineering; haughty
impermeable
not permitting passage
impertinent
rude; disrespectful
imperturbable
steady; calm
impervious
not capable of being affected; hardened
impetuous
acting without thought; impulsive
impetus
a stimulus; a moving force
impinge
to strike; to collide; to encroach upon
impious
disrespectful toward God
implacable
unbending; merciless; inflexible
implausible
unbelievable
implement
a tool; to carry out or put into practice
implication
an indirect indication; a statement that suggests something
implicit
suggested, but not plainly expressed
imply
to suggest
import
significance; meaning; to bring in from a foreign country
importune
to persistently ask; to beg
impostor
a person who goes about under an assumed name or character
impotent
powerless; lacking strength
imprecation
a curse
impregnable
unconquerable
impromptu
without preparation; offhand
impropriety
pertaining to something that is not proper or suitable
improvident
wasteful
improvise
to do without preparation
impudent
disrespectful; shameless
impugn
to attack a person with words; to challenge a person in regard to motives
impunity
freedom from punishment
impute
to accuse or attribute a person of wrongdoing
inadvertent
unintentional
inalienable
not able to be transferred to another
inane
silly; meaningless
inanimate
lifeless; dull; dead
inarticulate
pertaining to speech that is not clear or understandable
incandescent
very bright and shining
incapacitated
disabled; unable to function
incarcerate
to imprison
incarnadine
flesh-colored; blood-red
incarnate
in human form
incendiary
causing fire; to stir up trouble
incense
to inflame or enrage
incentive
something that incites to action
inception
beginning; start
incessant
without pause; continuous
inchoate
at an early stage; just beginning
incipient
beginning to exist or appear
incisive
sharp; keen
incite
to stir up or urge into action
inclement
(usually pertaining to weather) harsh; unfavorable
incognito
disguised
incoherent
rambling; not logically connected
incongruous
unsuited; inappropriate
inconsequential
unimportant
incontrovertible
certain; undeniable
incorrigible
bad beyond correction or reform
incredulous
skeptical; disbelieving
increment
an increase or gain
incriminate
to charge with wrongdoing
incubus
nightmare
inculcate
(in or upon) to teach earnestly; to influence someone to accept an idea
incumbent
resting or lying down; one who holds a political office
incur
to bring upon oneself; to run into some undesirable consequence
incursion
a raid or invasion
indefatigable
incapable of being tired out
indelible
incapable of being erased
indemnify
to insure; to repay
indicative
signifying; implying
indict
to charge with wrongdoing
indigenous
native to a particular area; inborn
indigent
extremely poor
indignant
angry as a result of unjust treatment
indisputable
without doubt; unquestionable
indissoluble
permanent
indoctrinate
to teach someone principles or beliefs
indolent
lazy
indomitable
unconquerable; unyielding
indubitable
unquestionable; certain
induce
to cause; to bring about
indulgence
gentle treatment; tolerance
inebriated
drunk
ineffable
not able to be described; unspeakable
ineluctable
inevitable; inescapable
inept
unfit; bungling; inefficient
inert
without power to move; inactive
inevitable
sure to happen; unavoidable
inexorable
unyielding
infallible
certain; without mistakes
infamous
having an extremely bad reputation
infantile
childish; immature
infectious
passing on a disease; likely to spread
infer
to derive by reasoning
infernal
hellish; fiendish
infidel
unbeliever
infinitesimal
exceedingly small
infirmity
weakness or feebleness
inflated
puffed up; swollen
influx
a flowing in
infraction
the breaking of a law or rule
infringe
(on or upon) to violate or trespass
ingenious
clever
ingenuous
simple; innocent
ingrate
ungrateful person
ingratiate
(oneself) to work one's way into another's favor
inherent
inborn
inhibition
restraint; reserve
inimical
harmful; unfriendly
inimitable
not able to be imitated or equaled
iniquity
wickedness
initiate
to begin
injunction
a command; an order
inkling
a hint
innate
inborn; existing from birth
innocuous
harmless
innovate
to introduce a new idea
innuendo
indirect remark; hint
inordinate
unusual; excessive
insatiable
unable to be satisfied
inscrutable
difficult to understand; mysterious
insidious
treacherous
insightful
having a penetrating understanding of things; mentally alert and sharp
insinuate
to suggest or hint
insipid
dull; tasteless
insolent
boldly disrespectful
insolvent
bankrupt; unable to pay creditors
insomnia
sleeplessness
insouciant
carefree
instigate
to provoke or stir up
insubordinate
disobedient
insular
pertaining to an island; isolated
insuperable
unconquerable
insurgence
rebellion
insurrection
rebellion
intact
entire; left whole
integral
essential
integrate
unify; to bring together into a whole
integrity
honesty; sincerity
intellectual
intelligent; having mental capacity to a high degree
intelligentsia
highly educated, cultured people
interdict
to prohibit or ban
interim
period of time between
interlocutor
one who takes part in a conversion
interloper
an intruder
interlude
a period of time between two events
interminable
endless
intermittent
starting and stopping
interpolate
to insert between; to estimate
interpose
to place between
interregnum
pause; any period during which a nation is without a permanent leader
interrogate
to question
interstellar
between or among stars
intervene
to come between
intimate
private or personal; to imply
intimidate
make afraid; threaten
intolerant
narrow-minded
intractable
hard to manage
intransigent
stubborn; refusing to give in
intrepid
fearless
intricate
complex; hard to understand
intrinsic
essential
introspective
looking into one's self
introvert
a person concerned with his own thoughts or feelings
intuitive
insightful; knowing by a hidden sense
inundate
to fill to overflowing
inured
(to) accustomed to
invalidate
to deprive of legal value; to make null and void
invariably
constantly; without changing
invective
strong verbal abuse
inveigh
(against) to make bitter verbal attack
inveigle
to trick or deceive
invert
to turn upside-down or inside-out
inveterate
firmly established; deep-rooted
invidious
causing resentment
invigorate
to fill with energy
invincible
unconquerable
invoke
to call upon
invulnerable
immune to attack
iota
a small quantity
irascible
easily angered
ire
anger; wrath
iridescent
displaying a wide range of colors like those of the rainbow
irksome
bothersome
ironic
contrary to what was expected
irrational
senseless; unreasonable
irreconcilable
unable to agree
irredeemable
hopeless; unable to be brought back
irremediable
unable to be cured or corrected
irreparable
beyond repair
irrepressible
unable to be controlled or restrained
irresolute
indecisive
irreverent
disrespectful
irrevocable
final; unchangeable
itinerant
traveling from place to place

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