| torpid(adjective, dull, quiet, flat, low) |
| vapid(adjective, dull, weak, flat, boring) |
| wooden(adjective, dull, uninteresting, lackluster, unexciting) |
| abeyant(adjective, dull, idle, sluggish, lazy) |
| asleep(adjective, dull, quiet, slow, heavy) |
| austere(adjective, dull, unhappy, dark, gloomy) |
| backward(adjective, dull, moderate, low, stiff) |
| banal(adjective, dull, weak, boring, dead) |
| barren |
| behind(adjective, dull, moderate, low, stiff) |
| behindhand(adjective, dull, moderate, low, stiff) |
| belated(adjective, dull, moderate, low, stiff) |
| bland(adjective, dull, weak, dead, tedious) |
| blank |
| bleak(adjective, dull, unhappy, dark, gloomy) |
| blind(adjective, dull, weak, flat, dead) |
| bloodless |
| broken(adjective, dull, flat, low, sad) |
| bromidic(adjective, dull, simple, boring, dreary) |
| callous(adjective, indifferent, unconcerned, uncaring, passive) |