| arid(adjective, dull, excite, stupid, boring) |
| depressing(adjective, dull, blue, sad, unhappy) |
| dun(adjective, dull, soft, obscure, flat) |
| lifeless(adjective, dull, weak, simple, soft) |
| sober(adjective, calm, dull, soft, obscure) |
| dispiriting(adjective, dull, unhappy, dark, gloomy) |
| grim(adjective, dull, blue, sad, unhappy) |
| humdrum(adjective, dull, simple, clean, plain) |
| lackluster(adjective, dull, simple, blue, excite) |
| uninteresting(adjective, dull, weak, stupid, boring) |
| vapid(adjective, dull, weak, simple, flat) |
| whore |
| bleak(adjective, dull, unhappy, dark, gloomy) |
| brown(noun, adjective, dull, dark, color) |
| colorless(adjective, dull, weak, simple, soft) |
| dim(adjective, dull, weak, soft, blue) |
| disconsolate(adjective, dull, blue, sad, unhappy) |
| dowdy(adjective, uncleanness, unfashionable, dressed) |
| dry(adjective, dull, hard, simple, flat) |
| insipid(adjective, dull, hard, weak, stupid) |