| frenzied(adjective, silly, foolish, stupid, crazy) |
| illogical(false, foolish, unstable, ill, shaky) |
| loon(noun, person, informal, mad, wise) |
| manic(adjective, crazy) |
| nutter(noun, worrier, valetudinary) |
| odd(adjective, wild, silly, foolish, crazy) |
| silly(adjective, weak, simple, knowledge, ability) |
| swashbuckler |
| zealot(noun, person, crazy, nut, fanatic) |
| asinine(adjective, weak, simple, silly, foolish) |
| bats |
| berserk(adjective, silly, foolish, crazy, mad) |
| crack-brained(adjective, insane) |
| crackbrained |
| demoniac(noun, adjective, person, mad, insane) |
| ding-a-ling(noun, slang, wise, crackpot) |
| disturbed(adjective, hot, mad, unstable, insane) |
| eccentric(noun, adjective, wild, silly, foolish) |
| fiend(noun, person, crazy, nut, fanatic) |
| goofy(adjective, silly, foolish, unwise) |