1590s, from ill (adv.) + advised, past-participle adjective from advise (v.) in its original (but now obsolete) reflexive sense "take thought, consider." Related: Ill-advisedly.
ill-advised efforts
it would be ill-advised to accept the offer
Iliad
ilium
Ilium
ilk
ill
ill-advised
illative
ill-bred
illegal
illegality
illegally
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