| lunatic(adjective, foolish, crazy, insane, unintelligent) |
| meekest(adjective, calm, quiet, humble, shy) |
| mousy(adjective, quiet, soft, still, speak) |
| muffled(adjective, close, quiet, soft, low) |
| nitwit(noun, adjective, foolish) |
| nitwitted(adjective, silly, stupid, green, fat) |
| overawe(verb, calm, dull, quiet, suppress) |
| pinheaded |
| pipe down(verb, expression, phrasal verb, calm, dull) |
| purblind |
| quell(verb, calm, dull, quiet, suppress) |
| quiet down(verb, expression, phrasal verb, calm, dull) |
| rattle-brained |
| retarded(adjective, dull, stupid, impulsive, impractical) |
| say nothing(verb, expression, calm, dull, quiet) |
| screwball |
| secretive(adjective, close, quiet, soft, low) |
| shadowy |
| shush(verb, calm, dull, quiet, suppress) |
| simpleminded(adjective, dull, simple, silly, foolish) |