| bedlam |
| bereft of reason(expression, idiom, insanity) |
| buggy(adjective, slang, silly, foolish, crazy) |
| crazy person(noun, expression, idiom, person) |
| dement(noun, crazy, cuckoo, loony, neurotic) |
| dumb(adjective, foolish, crazy, insane, unintelligent) |
| fanatic(noun, crazy, nut, loony, enthusiast) |
| fantastic(weak, simple, silly, foolish, thoughtless) |
| flake(noun, person, mad) |
| flipped out(expression, adjective, silly, crazy, mad) |
| freaked out(expression, adjective, silly, crazy, mad) |
| fruitcake(noun, person, mad, nut, fanatic) |
| half-baked(weak, simple, silly, foolish, thoughtless) |
| half-witted(weak, simple, silly, foolish, thoughtless) |
| harebrain(noun, crazy, loony) |
| harebrained(adjective, weak, simple, knowledge, ability) |
| hypochondriac(madman, worrier, nutter, valetudinary) |
| ill(adjective, unstable, shaky, insane, unhealthy) |
| kinky(adjective, unstable, disturbed, unhinged) |
| lamebrain(noun, person, mad, schizophrenic, worrier) |