| crackpot(adjective, impractical, half-baked, doomed) |
| credulous(adjective, foolish, stupid, innocent, green) |
| demented(adjective, wrong, wild, foolish, stupid) |
| gaga(adjective, ability, informal) |
| green(adjective, foolish, stupid, innocent, thick) |
| heedless(adjective, careless, foolish, crazy, senseless) |
| ignoramus(noun, simple, fool, innocent, jerk) |
| incongruous(adjective, foolish, stupid, insignificant, unreasonable) |
| inconsequential(adjective, wrong, slight, small, foolish) |
| injudicious(adjective, weak, simple, careless, foolish) |
| jejune(adjective, dull, soft, slight, flat) |
| lightheaded |
| loco |
| loopy(adjective, knowledge, ability, informal, foolish) |
| madcap(adjective, careless, foolish, crazy, vague) |
| muzzy |
| nitwit(noun, simple, fool, innocent, jerk) |
| potty(adjective, wild, foolish, stupid, crazy) |
| rattlebrained |
| stunned |