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Definition of insane:

  1. Causing insanity or madness.
  2. Characterized by insanity or the utmost folly; chimerical; unpractical; as, an insane plan, attempt, etc.
  3. Exhibiting unsoundness or disorded of mind; not sane; mad; deranged in mind; delirious; distracted. See Insanity, 2.
  4. Used by, or appropriated to, insane persons; as, an insane hospital.

Synonyms:

haywire, schizophrenic, crackbrained, crackers, lunatic, maniacal, noncompos mentis, berserk, unstable, raving mad, loopy, demented, certifiable, zany, cuckoo, amuck, half-crazed, possessed, unearthly, batty, certified, amok, of unsound mind, unhinged, deranged, kookie, screwy, psychopathologic, foolish, kooky, bats, round the bend, daft, fruity, unbalanced, crazy, loco, sore, unsound, psychopathological, balmy, dotty, bananas, moonstruck, wild, raving, brainsick, nonsensical, sick, softheaded, excited, psychopathic, tomfool, wacky, wrong, dopey, sappy, silly, screw-loose, demoniacal, jerky, manic-depressive, disturbed, demoniac, whacky, non compos mentis, maniac, daffy, barmy, gaga, distracted, bonkers, off, hebephrenic, moronic, stupid, buggy, maniclike, imbecilic, psychotic, harebrained, absurd, fey, cockeyed, madcap, sane, dippy, touched, huffy, crazed, idiotic, distraught, cracked, nuts, around the bend, nutty, paranoid, mentally ill, unrestrained, preposterous, loony, ability, knowledge, mad.

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