| foolish(silly, stupid, crazy, insane, unintelligent) |
| gaga(adjective, ability, informal) |
| giddy(adjective, ability) |
| idiotic(adjective, silly, foolish, stupid, crazy) |
| ignorant(adjective, impulsive, unfamiliar, impractical, unknowing) |
| imbecilic(adjective, foolish, crazy, innocent, vague) |
| lighthearted(adjective, ability) |
| mindless(adjective, silly, foolish, innocent, dense) |
| moronic(adjective, dull, simple, slow, silly) |
| obtuse(adjective, innocent, thick, unfamiliar, unconscious) |
| scatterbrained(adjective, ability) |
| senseless(foolish, crazy, impulsive, insane, unintelligent) |
| shallow(adjective, stupid, innocent, thick, unfamiliar) |
| slow(dull, simple, limited, impulsive, impractical) |
| thick(adjective, innocent, green, unfamiliar, unconscious) |
| thick-witted(foolish, crazy, insane) |
| unintelligent(silly, foolish, stupid, crazy, insane) |
| vacuous(adjective, empty, unintelligent) |
| absurd(silly, foolish, impractical, unintelligent, unaware) |
| apprenticed(adjective, innocent, thick, unfamiliar, unconscious) |