| Main Entry: | |
| Part of Speech: | noun |
| Definition: | person who is crazy, mad |
| Synonyms: | crackpot, crank, cuckoo, demoniac, flake, fruitcake, kook, lamebrain, loon, maniac, neurotic, nut*, paranoid, psycho, psychopath, psychotic, scatterbrain, schizophrenic, sociopathic |
| Antonyms: | sane |
| Main Entry: | mad person |
| Part of Speech: | noun |
| Definition: | person who is considered mentally ill |
| Synonyms: | bedlamite, crazy person, demented, deranged, idiot, imbecile, loon, lunatic, maniac, mental case, patient, psycho, psychopath, psychotic, raver, schizophrenic, sociopath |
| Main Entry: | maniac |
| Part of Speech: | noun |
| Definition: | person who is crazy, overenthusiastic |
| Synonyms: | Section 8, bedlamite, bigot, crackpot, enthusiast, fan, fanatic, fiend, flake, freak, fruitcake, kook, loon, loony, lunatic, madperson, nut*, nutcase, psycho, psychopath, schizoid, screwball, zealot |
| Notes: | a maniac is an insane person, while manic means affected with or marked by frenzy or mania uncontrolled by reason |
| Main Entry: | nut |
| Part of Speech: | noun |
| Definition: | crazy, overenthusiastic person |
| Synonyms: | bedlamite, bigot, crackpot, crank, dement, eccentric, fanatic, fiend, freak, harebrain, loony, lunatic, maniac, non compos mentis, screwball, zealot |
| Antonyms: | sane person |
| Main Entry: | psychopath |
| Part of Speech: | noun |
| Definition: | person who is mentally deranged, often prone to hurt others |
| Synonyms: | antisocial personality, insane person, lunatic, mad person, maniac, mental case, nutcase, psycho, psychotic, schizoid, sociopath, unstable personality |
| Main Entry: | sociopath |
| Part of Speech: | noun |
| Definition: | psychopath |
| Synonyms: | antisocial personality, crazy person, deranged person, insane person, lunatic, mad person, maniac, psycho, psychotic, schizoid |
| Main Entry: | crazy person |
| Part of Speech: | noun |
| Definition: | insane person |
| Synonyms: | deranged person, lunatic, maniac, nut, nut case, psychopath, sociopath |
| Main Entry: | insane person |
| Part of Speech: | noun |
| Definition: | mentally deranged person |
| Synonyms: | dement, fruitcake, head case, lunatic, madman, madwoman, maniac, mental defective, neurotic, non compos, nutter, raving lunatic |
| Main Entry: | madperson |
| Part of Speech: | noun |
| Definition: | nut |
| Synonyms: | bedlamite, crazy person, cuckoo, dement, deranged, idiot, imbecile, loon, loony, lunatic, madman, madwoman, maniac, mental case, nut, nutcase, oddball, patient, psycho, psychopath, psychotic, raver, screwball |