| a. | 1. | Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted. See Insanity, 2. |
| 2. | Used by, or appropriated to, insane persons; | |
| 3. | Causing insanity or madness. | |
| 4. | Characterized by insanity or the utmost folly; chimerical; unpractical; |
| Adj. | 1. | insane - afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter" Antonyms: sane - mentally healthy; free from mental disorder; "appears to be completely sane" |
| 2. | insane - very foolish; "harebrained ideas"; "took insane risks behind the wheel"; "a completely mad scheme to build a bridge between two mountains" Synonyms: harebrained, mad |
INSANE. One deprived of the use of reason, after he has arrived at the age when he ought to have it, either by a natural defect or by accident. Domat, Lois Civ. Lib. prel. tit. 2, s. 1, n. 11.
abnormal, absurd, apish, asinine, at fever pitch, batty, bedlamite, befooled, beguiled, bereft of reason, besotted, bonkers, brainless, brainsick, buffoonish, buggy, bughouse, bugs, certifiable, cockeyed, crackbrained, cracked, crackers, cranky, crazed, credulous, cuckoo, daffy, daft, dazed, deluded, deprived of reason, disordered, disoriented, distraught, dizzy, doting, dotty, dull, dumb, eccentric, fanatical, fatuitous, fatuous, febrile, feverish, flaky, flighty, fond, fool, foolheaded, frantic, frenetic, frenzied, fruity, fuddled, furious, futile, gaga, goofy, gulled, hallucinated, hectic, hysteric, imbecile, imbecilic, inane, inept, infatuated, irrational, irresponsible, kinky, kooky, loco, loony, loopy, ludicrous, lunatic, maddened, maniac, manic, maudlin, mazed, mental, mentally deficient, meshuggah, mindless, moon-struck, moronic, neurotic, non compos, non compos mentis, nonsensical, not all there, not right, nuts, nutty, odd, of unsound mind, off, out of it, overanxious, overdesirous, overeager, overenthusiastic, overzealous, perfervid, potty, psycho, psychoneurotic, psychotic, queer, quirky, reasonless, reckless, ridiculous, round the bend, sappy, scatterbrained, schizo, schizoid, schizophrenic, screwy, senseless, sentimental, sick, silly, spaced out, spacy, stark-mad, stark-staring mad, strange, stupid, tetched, thoughtless, touched, ultrazealous, unbalanced, unhinged, unrealistic, unsane, unsettled, unsound, wacky, wandering, wet, wild, witless