sane

A sane person doesn't have any screws loose — in other words, they're free of mental illness and in a reasonable state of mind.

You probably know that the word insane means crazy. Well, the opposite of insane is sane — or not crazy. A sane person is of sound mind and is mentally healthy. Sane people have good judgment, are reasonable, and can tell the difference between what's real and imagined. Whenever someone commits a crime or does something totally outlandish, people usually wonder if they're sane or not.

Definitions of sane
  1. adjective
    mentally healthy; free from mental disorder
    “appears to be completely sane
    Synonyms:
    rational
    consistent with or based on or using reason
    compos mentis, of sound mind
    of sound mind, memory, and understanding; in law, competent to go to trial
    in her right mind, in his right mind, in their right minds
    behaving responsibly
    lucid
    having a clear mind
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    Antonyms:
    insane
    afflicted with or characteristic of mental derangement
    irrational
    not consistent with or using reason
    unreasonable
    not reasonable; not showing good judgment
    amok, amuck, berserk, demoniac, demoniacal, possessed
    frenzied as if possessed by a demon
    around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky
    informal or slang terms for mentally irregular
    brainsick, crazy, demented, disturbed, mad, sick, unbalanced, unhinged
    affected with madness or insanity
    certifiable, certified
    fit to be certified as insane (and treated accordingly)
    crackbrained, idiotic
    insanely irresponsible
    crazed, deranged, half-crazed
    driven insane
    fey, touched
    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
    maniac, maniacal
    wildly disordered
    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
    non compos mentis, of unsound mind
    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
    schizophrenic
    suffering from some form of schizophrenia
    screw-loose, screwy
    not behaving normally
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  2. adjective
    marked by sound judgment
    sane nuclear policy”
    synonyms: reasonable
    rational
    consistent with or based on or using reason
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