| imbecile | | |
| n. (person) | 1. changeling, cretin, half-wit, idiot, imbecile, moron, retard | a person of subnormal intelligence. |
| ~ mongoloid | a person suffering from Down syndrome (no longer used technically in this sense). |
| ~ simpleton, simple | a person lacking intelligence or common sense. |
| adj. | 2. idiotic, imbecile, imbecilic | having a mental age of three to seven years. |
| ~ retarded | relatively slow in mental or emotional or physical development.; "providing a secure and sometimes happy life for the retarded" |
| lunatic | | |
| n. (person) | 1. lunatic, madman, maniac | an insane person. |
| ~ crazy, looney, loony, nutcase, weirdo | someone deranged and possibly dangerous. |
| ~ bedlamite | an archaic term for a lunatic. |
| ~ pyromaniac | a person with a mania for setting things on fire. |
| ~ madwoman | a woman lunatic. |
| ~ diseased person, sick person, sufferer | a person suffering from an illness. |
| n. (person) | 2. daredevil, harum-scarum, hothead, lunatic, madcap, swashbuckler | a reckless impetuous irresponsible person. |
| ~ adventurer, venturer | a person who enjoys taking risks. |
| ~ tearaway | a reckless and impetuous person. |
| adj. | 3. lunatic, moonstruck | insane and believed to be affected by the phases of the moon. |
| ~ colloquialism | a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech. |
| ~ insane | afflicted with or characteristic of mental derangement.; "was declared insane"; "insane laughter" |
| insane | | |
| adj. | 1. insane | afflicted with or characteristic of mental derangement.; "was declared insane"; "insane laughter" |
| ~ irrational | not consistent with or using reason.; "irrational fears"; "irrational animals" |
| ~ unreasonable | not reasonable; not showing good judgment. |
| ~ amok, amuck, berserk, demoniac, demoniacal, possessed | frenzied as if possessed by a demon.; "the soldier was completely amuck"; "berserk with grief"; "a berserk worker smashing windows" |
| ~ around the bend, balmy, bats, batty, bonkers, buggy, crackers, daft, dotty, haywire, kookie, kooky, loco, loony, nuts, round the bend, barmy, fruity, loopy, nutty, wacky, whacky, cracked | informal or slang terms for mentally irregular.; "it used to drive my husband balmy" |
| ~ brainsick, crazy, demented, unhinged, mad, unbalanced, sick, disturbed | 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 | 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.; "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, 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.; "a raving lunatic" |
| ~ schizophrenic | suffering from some form of schizophrenia.; "schizophrenic patients" |
| ~ screw-loose, screwy | not behaving normally. |
| adj. | 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 | devoid of good sense or judgment.; "foolish remarks"; "a foolish decision" |
| mad | | |
| adj. | 1. huffy, mad, sore | roused to anger.; "stayed huffy a good while"; "she gets mad when you wake her up so early"; "mad at his friend"; "sore over a remark" |
| ~ colloquialism | a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech. |
| ~ angry | feeling or showing anger.; "angry at the weather"; "angry customers"; "an angry silence"; "sending angry letters to the papers" |
| adj. | 2. brainsick, crazy, demented, disturbed, mad, sick, unbalanced, unhinged | affected with madness or insanity.; "a man who had gone mad" |
| ~ insane | afflicted with or characteristic of mental derangement.; "was declared insane"; "insane laughter" |
| adj. | 3. delirious, excited, frantic, mad, unrestrained | marked by uncontrolled excitement or emotion.; "a crowd of delirious baseball fans"; "something frantic in their gaiety"; "a mad whirl of pleasure" |
| ~ wild | marked by extreme lack of restraint or control.; "wild talk"; "wild parties" |
| rabid | | |
| adj. (pertain) | 1. rabid | of or infected by rabies. |
| adj. | 2. fanatic, fanatical, overzealous, rabid | marked by excessive enthusiasm for and intense devotion to a cause or idea.; "rabid isolationist" |
| ~ passionate | having or expressing strong emotions. |
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