| bonkers(adjective, simple, foolish, crazy, mad) |
| droll |
| fallacious(adjective, foolish, unreasonable, absurd, irrational) |
| feather-brained |
| frothy(adjective, ability) |
| grotesque(adjective, ridiculous) |
| gullible(adjective, stupid, innocent, green, fat) |
| half-witted(adjective, dull, weak, simple, foolish) |
| halfwit(noun, simple, fool, innocent, jerk) |
| hasty(adjective, slight, detail, foolish, trivial) |
| haywire |
| ill-judged(adjective, impractical, half-baked, doomed, imbecility folly) |
| implausible(adjective, absurd, excessive, expensive, steep) |
| improper(adjective, imbecility folly) |
| indiscreet(adjective, weak, simple, foolish, thoughtless) |
| infatuated |
| insignificant(adjective, slight, small, stupid, useless) |
| invalid(adjective, foolish, unreasonable, absurd, irrational) |
| muddleheaded(adjective, senseless) |
| naive(adjective, foolish, innocent, rash, risky) |