Antonyms of adj insane

2 senses of insane

Sense 1
insane (vs. sane) -- (afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter")

sane (vs. insane) -- (mentally healthy; free from mental disorder; "appears to be completely sane")
        => compos mentis (predicate), of sound mind (predicate) -- (of sound mind, memory, and understanding; in law, competent to go to trial)
        => in his right mind (predicate), in her right mind (predicate), in their right minds (predicate) -- (behaving responsibly)
        => lucid -- (having a clear mind; "a lucid moment in his madness")

Sense 2
harebrained, insane, mad -- (very foolish; "harebrained ideas"; "took insane risks behind the wheel"; "a completely mad scheme to build a bridge between two mountains")

INDIRECT (VIA foolish) -> wise -- (having or prompted by wisdom or discernment; "a wise leader"; "a wise and perceptive comment")

Similarity of adj insane

2 senses of insane

Sense 1
insane (vs. sane) -- (afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter")
       => amuck, amok, berserk, demoniac, demoniacal, possessed (predicate) -- (frenzied as if possessed by a demon; "the soldier was completely amuck"; "berserk with grief"; "a berserk worker smashing windows")
       => balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky -- (informal or slang terms for mentally irregular; "it used to drive my husband balmy")
       => brainsick, crazy, demented, disturbed, mad, sick, unbalanced, unhinged -- (affected with madness or insanity; "a man who had gone mad")
       => certifiable, certified -- (fit to be certified as insane (and treated accordingly))
       => crackbrained, idiotic -- (insanely irresponsible; "an idiotic idea")
       => crazed, deranged, half-crazed -- (driven insane)
       => fey, touched (predicate) -- (slightly insane)
       => hebephrenic -- (suffering from a form of schizophrenia characterized by foolish mannerisms and senseless laughter along with delusions and regressive behavior)
       => lunatic, moonstruck -- (insane and believed to be affected by the phases of the moon)
       => maniacal, maniac (predicate) -- (wildly disordered; "a maniacal frenzy")
       => manic-depressive -- (suffering from a disorder characterized by alternating mania and depression)
       => maniclike -- (resembling the mania of manic-depressive illness)
       => mentally ill, unsound, unstable -- (suffering from severe mental illness; "of unsound mind")
       => non compos mentis (predicate), of unsound mind (predicate) -- (not of sound mind, memory, or understanding; in law, not competent to go to trial)
       => paranoid -- (suffering from paranoia)
       => psychopathic, psychopathologic, psychopathological -- (suffering from an undiagnosed mental disorder)
       => psychotic -- (characteristic of or suffering from psychosis)
       => raving mad, wild -- (talking or behaving irrationally; "a raving lunatic")
       => schizophrenic -- (suffering from some form of schizophrenia; "schizophrenic patients")
       => screw-loose, screwy -- (not behaving normally)
          Also See-> irrational#1; unreasonable#1

Sense 2
harebrained, insane, mad -- (very foolish; "harebrained ideas"; "took insane risks behind the wheel"; "a completely mad scheme to build a bridge between two mountains")
       => foolish (vs. wise) -- (devoid of good sense or judgment; "foolish remarks"; "a foolish decision")

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