| jejune(adjective, dull, weak, flat, ordinary) |
| flat(adjective, dull, weak, plain, mild) |
| arid(adjective, dull, flat, stupid, ordinary) |
| blah(adjective, dull, weak, simple, flat) |
| colorless(adjective, dull, weak, flat, stupid) |
| common(adjective, dull, flat, stupid, ordinary) |
| commonplace(adjective, dull, flat, stupid, ordinary) |
| dead(adjective, dull, weak, flat, stupid) |
| dull(adjective, weak, plain, mild, stupid) |
| humdrum(adjective, dull, weak, flat, plain) |
| insipid(adjective, dull, weak, simple, flat) |
| monotonous(adjective, dull, weak, simple, flat) |
| prosaic(adjective, dull, bad, weak, flat) |
| prosy(adjective, dull, bad, weak, flat) |
| repetitious(adjective, dull, flat, stupid, ordinary) |
| routine(adjective, dull, flat, stupid, ordinary) |
| stale(adjective, dull, weak, flat, stupid) |
| stupid(adjective, dull, flat, ordinary) |
| tame(adjective, dull, weak, flat, plain) |
| tedious(adjective, dull, weak, simple, flat) |