| crazy(adjective, light, knowledge, ability, informal) |
| silly(adjective, knowledge, ability, foolish, stupid) |
| nutty(adjective, slang, crazy, mad) |
| mad(adjective, knowledge, ability, silly, foolish) |
| insane(adjective, knowledge, ability, silly, foolish) |
| absurd(adjective, light, knowledge, ability, foolish) |
| foolish(adjective, knowledge, ability, silly, stupid) |
| goofy(adjective, light, silly, stupid, crazy) |
| lunatic(adjective, knowledge, ability, silly, foolish) |
| wacky(adjective, knowledge, slang, ability, silly) |
| dotty(adjective, weak, simple, silly, foolish) |
| idiotic(adjective, simple, knowledge, ability, silly) |
| loony(adjective, light, knowledge, ability, informal) |
| daffy(adjective, slang, crazy, mad) |
| daft(adjective, weak, simple, silly, foolish) |
| fatuous(adjective, weak, simple, silly, foolish) |
| imbecilic(adjective, weak, simple, knowledge, ability) |
| moronic(adjective, weak, simple, knowledge, ability) |
| nonsensical(adjective, knowledge, ability, foolish, stupid) |
| stupid(adjective, weak, silly, foolish, crazy) |