| jackass(noun, adjective, foolish) |
| laconic(quiet, soft, still, aloof, reserved) |
| lost for words(adjective, calm, quiet, humble, silent) |
| muted(adjective, close, quiet, soft, low) |
| numskulled(adjective, dull, simple, slow, stupid) |
| preposterous(adjective, impractical, half-baked, doomed) |
| reserved(adjective, close, quiet, soft, low) |
| sappy |
| scatterbrained(adjective, simple, slow, silly, foolish) |
| sluggish(adjective, dull, simple, slow, silly) |
| subdued(adjective, quiet, soft, low) |
| crackpot(adjective, foolish, impractical, half-baked, doomed) |
| faint(adjective, quiet, soft, still, shaky) |
| heavy(adjective, dull, silly, stupid, impassive) |
| laughable(adjective, dull, unintelligent, witless) |
| noiseless(adjective, close, quiet, soft, low) |
| blockhead |
| blockish |
| bone-headed(adjective, foolish) |
| bonehead |