ISEE/SSAT Vocabulary Builder›Words›I

ISEE & SSAT vocabulary words starting with I

99 words from the 1,500-word ISEE and SSAT deck, each with its meaning. Open a word for example sentences, synonyms and antonyms.

ABCDEFGHIJKLMNOPQRSTUVWXYZ

• iconoclast noun — a person who attacks cherished beliefs or institutions
• identify verb — to determine what someone or something is
• idiosyncrasy noun — distinctive personal habit or characteristic
• ignoble adjective — dishonorable or lacking high moral character
• ignominious adjective — deserving public shame
• illiberal adjective — intolerant of views or behavior different from one's own
• imitate verb — to copy someone's actions, speech, or sounds
• immaterial adjective — irrelevant or unimportant to the matter being considered
• immense adjective — extremely large or great
• imminent adjective — about to happen
• immune adjective — protected against a particular disease or influence
• impalpable adjective — impossible or very difficult to touch or perceive
• impartial adjective — treating all sides equally; unbiased
• impassive adjective — showing no emotion or reaction
• impatient adjective — annoyed because something is taking too long
• impecunious adjective — having little or no money
• impede verb — to slow down or block the progress of
• imperil verb — to place in danger or at risk
• impertinent adjective — rude and disrespectful, especially toward someone of higher authority
• imperturbable adjective — remaining calm and untroubled under pressure
• impetuous adjective — acting suddenly on impulse, without thought of consequences
• implacable adjective — unable to be calmed, softened, or satisfied
• implicit adjective — suggested or understood without being stated directly
• imply verb — to suggest something without saying it directly
• import verb — to bring goods or materials in from another country
• imprudent adjective — not showing care or thought about the possible results of an action
• impudent adjective — boldly disrespectful toward someone who deserves courtesy
• impugn verb — to challenge the truth, honesty, or integrity of something
• inane adjective — lacking sense, meaning, or substance
• incapacitate verb — to make unable to function or act normally
• incarnate adjective — embodied in human or visible form
• incentive noun — something that motivates a person to act
• incessant adjective — continuing without pause
• inchoate adjective — just beginning and not yet fully formed
• incipient adjective — just beginning to appear or develop
• incisive adjective — clear, direct, and sharply analytical
• incite verb — to provoke or stir up a strong reaction, often unrest
• incongruous adjective — not in harmony with surroundings; out of place
• incontrovertible adjective — impossible to dispute or deny
• incorporate verb — to include something as part of a whole
• incorrigible adjective — unable to be corrected, improved, or reformed
• incredible adjective — so extraordinary that it is hard to believe
• indefatigable adjective — able to continue working without seeming to tire
• indescribable adjective — too extreme or unusual to be put into words
• indict verb — to formally accuse someone of a crime
• indifferent adjective — having no particular interest or concern
• indigence noun — extreme poverty; state of lacking basic necessities
• indigenous adjective — originating naturally in a particular place or region
• indigent adjective — extremely poor and lacking basic resources
• indignant adjective — angry at unfair treatment
• indolent adjective — wanting to avoid activity; lazy
• indomitable adjective — impossible to defeat, discourage, or subdue
• indubitable adjective — too certain to be doubted or questioned
• inept adjective — lacking skill or ability to do something properly
• inert adjective — lacking the ability or strength to move; inactive
• inevitable adjective — certain to happen; unavoidable
• inexorable adjective — impossible to stop, prevent, or persuade
• inference noun — a conclusion reached through reasoning rather than direct statement
• ingenious adjective — cleverly inventive and effective
• ingrained adjective — deeply established and difficult to change
• inimical adjective — harmful or hostile to something
• initial adjective — occurring at the beginning
• inject verb — to force a liquid into something using pressure
• innate adjective — existing in someone from birth rather than acquired
• innocuous adjective — not harmful or offensive
• inordinate adjective — far greater than is reasonable or expected
• inquire verb — to ask for information
• insatiable adjective — impossible to satisfy or fulfill
• inscrutable adjective — impossible to understand or interpret
• insecure adjective — not confident about oneself or a situation
• insidious adjective — causing harm gradually and without being noticed
• insipid adjective — lacking flavor, spirit, or interest; dull
• insist verb — to say firmly that something is true or must happen
• insolent adjective — showing a rude and disrespectful lack of regard for authority
• inspect verb — to examine something carefully
• instigate verb — to bring about or initiate, especially trouble
• instruct verb — to teach or direct someone in how to do something
• insular adjective — uninterested in ideas or people outside one's own group
• insurrection noun — organized revolt against a government or ruling authority
• interpret verb — to decide or explain what something means
• interrupt verb — to speak while someone else is still talking
• interval noun — a period of time or space between two things
• intimation noun — indirect suggestion, hint, or inkling
• intimidate verb — to frighten someone into doing what you want
• intractable adjective — extremely difficult to control, manage, or solve
• intransigent adjective — unwilling to compromise
• intrepid adjective — fearless and adventurous, especially in the face of danger
• intricate adjective — having many complexly arranged parts or details
• introduce verb — to bring something into use or present someone for the first time
• introduction noun — act of presenting something or someone for the first time, or an opening section of a text
• introspection noun — the examination of one's own thoughts and feelings
• inundate verb — to overwhelm someone with an excessive amount of something
• investigate verb — to search for facts or answers
• inveterate adjective — firmly established by long habit
• irascible adjective — prone to becoming angry easily
• irate adjective — extremely angry
• irk verb — to annoy or irritate
• irritable adjective — becoming annoyed or bothered very easily
• itinerant adjective — traveling from place to place rather than remaining settled

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