| bloodless(adjective, dull, light, weak, soft) |
| characterless(adjective, dull, mean, rough, poor) |
| dreary(adjective, dull, flat, gloomy, dirty) |
| insipid(adjective, dull, light, weak, soft) |
| livid(adjective, dull, light, weak, soft) |
| lusterless(adjective, dull, beat, weak, simple) |
| monotonous(adjective, dull, weak, simple, flat) |
| pedestrian(adjective, dull, mean, simple, rough) |
| prosy(adjective, dull, mean, weak, simple) |
| vapid(adjective, dull, weak, simple, flat) |
| wan(verb, adjective, dull, light, weak) |
| arid(adjective, dull, flat, excite, stupid) |
| ashy(adjective, dull, light, soft, poor) |
| dry(adjective, dull, simple, flat, excite) |
| lurid(adjective, dull, light, soft, poor) |
| waxen(adjective, dull, light, soft, poor) |
| dingy(adjective, tacky, soiled) |
| hueless |
| jejune(adjective, dull, weak, flat, ordinary) |
| lacklustre(dull, pale, lifeless, lackluster, ashen) |