| brain-dead(adjective, stupid) |
| comatose(adjective, dull, quiet, weak, easy) |
| dazed(noun, adjective, dull, slow, high) |
| dippy(noun, adjective, knowledge, slang, ability) |
| drugged(adjective, lethargic) |
| gooselike |
| goosey |
| leaden(adjective, dull, weak, easy, slow) |
| lumpish(adjective, dull, slow, heavy, sluggish) |
| nonsensical(adjective, dull, knowledge, ability, foolish) |
| benumbed(adjective, stupid, high, apathetic, sluggish) |
| boneheaded(adjective, slow, stupid) |
| clueless(adjective, stupid, confused, lost, perplexed) |
| confused(adjective, slow, tired, lost, unsteady) |
| crazy(adjective, knowledge, ability, informal, foolish) |
| dull-witted |
| lackadaisical(adjective, dull, weak, easy, flat) |
| lifeless(adjective, dull, flat, low, sad) |
| loony(adjective, knowledge, ability, informal, foolish) |
| mad(adjective, knowledge, ability) |