| Main Entry: | |
| Part of Speech: | noun |
| Definition: | crazy person |
| Synonyms: | blockhead, bonehead, bozo, character, crackpot, dingbat, dumbbell, eccentric, fanatic, goof, kook, lunkhead, numbskull, nut, saphead |
| Main Entry: | haywire |
| Part of Speech: | adjective |
| Definition: | broken; crazy |
| Synonyms: | amiss, amok, batty, berserk, bonkers*, chaotic, confused, cracked, crazed, defective, disordered, disorganized, erratic, flipped, in a mess, in pieces, insane, mad, messy, nuts, orderless, out of order, out of whack, out to lunch, psycho, schizo, screwball, screwy, touched*, unbalanced, unglued, unhinged, wacky |
| Main Entry: | kook |
| Part of Speech: | noun |
| Definition: | eccentric person |
| Synonyms: | crackpot, crank, crazy*, dingbat, flake, fruitcake, lamebrain, lunatic, nut, screwball, wacko, weirdo |
| Main Entry: | loony |
| Part of Speech: | adjective |
| Definition: | crazy |
| Synonyms: | ape, barmy, batty, berserk, bonkers*, cracked, crazed, cuckoo, daffy, daft, delirious, demented, deranged, flaky, flipped out, insane, kooky, lunatic, mad, maniacal, mental*, nuts, nutty, out of one's mind, out to lunch, psycho, screwball, screwy, silly, touched*, unbalanced, wacky |
| 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: | oddity/oddball |
| Part of Speech: | noun |
| Definition: | person who is very different |
| Synonyms: | case*, character, duck*, eccentric, fish out of water, maverick, misfit, odd bird, original*, rara avis, screwball, weirdo* |
| Antonyms: | conservative, normal |
| Main Entry: | weirdo |
| Part of Speech: | noun |
| Definition: | freak, oddball |
| Synonyms: | case*, character, crackpot, eccentric, flake, fruitcake, geek*, misfit, nutcase, odd bird, screwball, strange bird |
| Main Entry: | cuckoo |
| Part of Speech: | adjective |
| Definition: | crazy |
| Synonyms: | batty, clock, daffy, fool, insane, nuts, screwball, silly, wacky |