| wearisome(adjective, dull, weak, stupid, boring) |
| ho-hum(adjective, dull, simple, flat, clean) |
| inane(adjective, dull, weak, soft, slight) |
| lacklustre |
| prosy(adjective, dull, weak, simple, flat) |
| trite(adjective, dull, set, simple, flat) |
| uninspiring(adjective, dull, weak, simple, flat) |
| cold(adjective, flat, feebleness) |
| commonplace(adjective, dull, set, simple, flat) |
| empty(adjective, slight, value, small, silly) |
| feeble(adjective, dull, weak, incompetence, dullard) |
| heavy(adjective, flat, stupid, ordinary, dry) |
| innocuous(adjective, good, dull, weak, flat) |
| pedestrian(adjective, dull, set, simple, flat) |
| plain(adjective, dull, weak, simple, flat) |
| prose(adjective, simple, flat, clean, plain) |
| run-of-the-mill(adjective, dull, set, flat, silly) |
| savourless |
| slow(adjective, dullness) |
| thin(adjective, dull, weak, flat, boring) |