| half-baked(adjective, dull, simple, slow, silly) |
| imbecile(adjective, dull, simple, silly, foolish) |
| senseless(adjective, dull, simple, slow, silly) |
| thickheaded(adjective, simple, ability, slow, stupid) |
| weak-minded(adjective, dull, simple, slow, stupid) |
| acquiescent(adjective, calm, quiet, humble, shy) |
| answerless(adjective, calm, quiet, humble, shy) |
| boneheaded(adjective, simple, slow, stupid, impulsive) |
| bovine(adjective, dull, heavy, stupid, impassive) |
| breathless(beat, confused, rambling, amazed, astonished) |
| can't say boo to a goose(adjective, calm, quiet, humble, shy) |
| clueless(adjective, stupid) |
| dotty(adjective, foolish) |
| insane(foolish, crazy, impractical, half-baked, doomed) |
| lamblike(adjective, calm, quiet, humble, shy) |
| mindless(adjective, dull, simple, slow, silly) |
| screwy |
| silence(verb, calm, dull, quiet, suppress) |
| still(verb, adjective, adverb, calm, dull) |
| tight-lipped(adjective, close, quiet, soft, low) |