| fool(noun, ability, fool) |
| idiot(noun, person, ability, fool) |
| absurd(adjective, knowledge, ability, foolish, senseless) |
| ass(noun, ability, fool) |
| imbecile(noun, ability, fool) |
| ninny(noun, simple, ability, fool, silly) |
| silly(noun, adjective, knowledge, ability, fool) |
| loony(adjective, knowledge, ability, informal, foolish) |
| lunatic(adjective, knowledge, ability, foolish) |
| mooncalf(noun, simple, ability, prompt, fool) |
| preposterous(adjective, knowledge, ability, foolish) |
| softhead(noun, simple, ability, prompt, fool) |
| zany(adjective, knowledge, ability, informal, fool) |
| crazy(adjective, knowledge, ability, informal, foolish) |
| daft(adjective, foolish) |
| goose(noun, simple, ability, informal, prompt) |
| harebrained(adjective, knowledge, ability, foolish) |
| insane(adjective, knowledge, ability, foolish) |
| jackass(noun, ability, fool) |
| jerk(noun, slang, ability, informal, fool) |