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Comprehensive
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ill-conceived poorly planned or thought out.
ill-considered done without due consideration; imprudent or unwise.
ill-disposed not favorable or receptive; hostile. [2 definitions]
illegal contrary to law, rules, or the like; unlawful. [2 definitions]
illegible difficult or impossible to read or decipher.
illegitimate not legitimate; unlawful. [6 definitions]
ill fame unfavorable reputation or name.
ill-fated fated to come to a bad end; doomed. [2 definitions]
ill-favored unattractive in appearance; ugly. [2 definitions]
ill-founded having little or no basis in fact or reason.
ill-gotten obtained by dishonest or evil means.
ill humor an unpleasant or irritable mood; disagreeableness.
illiberal lacking tolerance; bigoted.
illicit not permitted by custom or law; illegitimate.
illimitable not subject to limits; limitless.
Illinois a Midwestern U.S. state west of Indiana. (abbr.: IL) [3 definitions]
illiteracy the condition of being unable to read and write. [3 definitions]
illiterate unable to read or write. [5 definitions]
ill-mannered showing bad manners; impolite.
ill nature a disagreeable or spiteful disposition.
ill-natured showing a disagreeable temperament; bad-tempered; nasty.