| brainless(adjective, simple, slow, stupid, boring) |
| ignorant(adjective, simple, slow, stupid, sluggish) |
| insensate(adjective, simple, slow, stupid, boring) |
| unintelligent(adjective, simple, slow, stupid, boring) |
| witless(adjective, simple, slow, stupid, boring) |
| addled(adjective, simple, slow, stupid, boring) |
| backward(adjective, simple, slow, stupid, boring) |
| besotted(adjective, simple, slow, stupid, boring) |
| daffy(adjective, simple, slow, stupid, boring) |
| daft(adjective, simple, slow, stupid, boring) |
| dense(adjective, simple, slow, stupid, boring) |
| dim-witted(adjective, simple, slow, stupid, boring) |
| dreary |
| dull(adjective, sluggish, unintelligent, obtuse, plodding) |
| feeble-minded(adjective, simple, slow, stupid, boring) |
| foolish |
| half-baked(adjective, simple, slow, stupid, boring) |
| headless |
| indistinct |
| indolent(adjective, simple, slow, stupid, boring) |