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adj. 1. a. Of, exhibiting, or afflicted with mental derangement. Not used in psychiatric diagnosis. b. Characteristic of or associated with persons who are mentally deranged: an insane laugh; insane babbling. c. Intended for use by such persons: an insane asylum. 2. Having been determined to be in a condition that meets the legal definition of insanity. 3. Immoderate; wild: insane jealousy. 4. Very foolish; absurd: took insane risks behind the wheel. [Latin īnsānus : in-, not; see IN-1 + sānus, sane, healthy.] in·sanely adv. in·saneness n. |
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