| Dim |
| Dumb |
| Inane |
| Thick |
| Dense |
| Obtuse |
| Idiotic |
| Foolish |
| Doltish |
| Moronic |
| Asinine |
| Witless |
| Clueless |
| Bonehead |
| Blockhead |
| Pointless |
| Boneheaded |
| Half-witted |
| Dull-witted |
| Ill-advised |
| Unintelligent |
| Without reason |
| Not very bright |
| Not at all sharp |
| A few bricks shy of a load |
| I'm with ___" (T-shirt phrase) |