insane

insane
    adj 1: afflicted with or characteristic of mental derangement;
           "was declared insane"; "insane laughter" [ant: {sane}]
    2: very foolish; "harebrained ideas"; "took insane risks behind
       the wheel"; "a completely mad scheme to build a bridge
       between two mountains" [syn: {harebrained}, {insane}, {mad}]
    

Insane \In*sane"\, a. [L. insanus. See {In-} not, and {Sane}.]
   1. Exhibiting unsoundness or disorder of mind; not sane; mad;
      deranged in mind; delirious; distracted. See {Insanity},
      2.
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   2. Used by, or appropriated to, insane persons; as, an insane
      hospital.
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   3. Causing insanity or madness. [R.]
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            Or have we eaten on the insaneroot
            That takes the reason prisoner ?      --Shak.
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   4. Characterized by insanity or the utmost folly; chimerical;
      unpractical; as, an insane plan, attempt, etc.
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            I know not which was the insane measure. --Southey.
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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. 
    

156 Moby Thesaurus words for "insane":
      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, crazy,
      credulous, cuckoo, daffy, daft, dazed, delirious, deluded,
      demented, deprived of reason, deranged, disordered, disoriented,
      distraught, dizzy, doting, dotty, dull, dumb, eccentric, fanatical,
      fatuitous, fatuous, febrile, feverish, flaky, flighty, fond, fool,
      foolheaded, foolish, frantic, frenetic, frenzied, fruity, fuddled,
      furious, futile, gaga, goofy, gulled, hallucinated, hectic,
      hysteric, idiotic, imbecile, imbecilic, inane, inept, infatuated,
      irrational, irresponsible, kinky, kooky, loco, loony, loopy,
      ludicrous, lunatic, mad, maddened, maniac, maniacal, 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