| ignorant(adjective, dull, simple, slow, stupid) |
| imbecilic(adjective, dull, simple, slow, stupid) |
| indolent(adjective, simple, slow, stupid, boring) |
| insensate(adjective, simple, slow, stupid, boring) |
| knuckleheaded |
| moronic(adjective, simple, slow, stupid, boring) |
| muttonheaded |
| nitwitted |
| not bright(expression, adjective, simple, slow, stupid) |
| obtuse(adjective, dull, simple, slow, stupid) |
| scatterbrained(adjective, simple, slow, stupid, boring) |
| shallow(adjective, simple, slow, stupid, boring) |
| simple(adjective, dull, slow, stupid, sluggish) |
| simple-minded(adjective, simple, slow, stupid, boring) |
| slow(adjective, dull, simple, stupid, sluggish) |
| slow-witted(adjective, dull, slow, stupid) |
| sluggish(adjective, dull, simple, slow, stupid) |
| stolid(adjective, dull, simple, slow, stupid) |
| thick(adjective, dull, simple, slow, stupid) |
| unintellectual(adjective, simple, slow, stupid, boring) |