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Definition of Insane
1. Adjective. Afflicted with or characteristic of mental derangement. "Insane laughter"
Similar to: Amok, Amuck, Berserk, Demoniac, Demoniacal, Possessed, 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, Brainsick, Crazy, Demented, Disturbed, Mad, Sick, Unbalanced, Unhinged, Certifiable, Certified, Crackbrained, Idiotic, Crazed, Deranged, Half-crazed, Fey, Touched, Hebephrenic, Lunatic, Moonstruck, Maniac, Maniacal, Manic-depressive, Maniclike, Mentally Ill, Unsound, Unstable, Non Compos Mentis, Of Unsound Mind, Paranoid, Psychopathic, Psychopathologic, Psychopathological, Psychotic, Raving Mad, Wild, Schizophrenic, Screw-loose, Screwy
Derivative terms: Insaneness, Insanity
Antonyms: Sane
2. Adjective. Very foolish. "A completely mad scheme to build a bridge between two mountains"
Definition of Insane
1. a. Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted. See Insanity, 2.
Definition of Insane
1. Adjective. Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted. ¹
2. Adjective. Used by, or appropriated to, insane persons; as, an insane hospital. ¹
3. Adjective. Causing insanity or madness. ¹
4. Adjective. Characterized by insanity or the utmost folly; chimerical; unpractical; as, an insane plan, attempt, etc. ¹
¹ Source: wiktionary.com
Definition of Insane
1. mentally unsound [adj -SANER, -SANEST] : INSANELY [adv]
Medical Definition of Insane
1. 1. Of unsound mind; severely mentally impaired; deranged; crazy. 2. Relating to insanity. Origin: L. In-neg. + sanus, sound, sane (05 Mar 2000)