Antonyms of adj sane

2 senses of sane

Sense 1
sane (vs. insane) -- (mentally healthy; free from mental disorder; "appears to be completely sane")

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)

Sense 2
reasonable, sane -- (marked by sound judgment; "sane nuclear policy")

INDIRECT (VIA rational) -> irrational -- (not consistent with or using reason; "irrational fears"; "irrational animals")

Similarity of adj sane

2 senses of sane

Sense 1
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")
          Also See-> rational#1

Sense 2
reasonable, sane -- (marked by sound judgment; "sane nuclear policy")
       => rational (vs. irrational) -- (consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought")