| dull(adjective, weak, simple, tough, plain) |
| prosaic(adjective, dull, bad, weak, simple) |
| flat(adjective, dull, simple, tough, plain) |
| humdrum(adjective, dull, simple, flat, plain) |
| tedious(adjective, dull, weak, simple, flat) |
| jejune(adjective, dull, weak, flat, stupid) |
| tiresome(adjective, dull, flat, stupid, ordinary) |
| vapid(adjective, dull, weak, simple, flat) |
| insipid(adjective, dull, weak, flat, ordinary) |
| uninteresting(adjective, dull, weak, flat, ordinary) |
| commonplace(adjective, dull, simple, flat, plain) |
| lifeless(adjective, dull, weak, simple, tough) |
| monotonous(adjective, dull, weak, simple, flat) |
| arid(adjective, dull, flat, stupid, ordinary) |
| boring(adjective, dull, weak, simple, flat) |
| colorless(adjective, dull, mean, weak, simple) |
| common(adjective, dull, simple, flat, rough) |
| dreary(adjective, dull, flat, stupid, ordinary) |
| unimaginative(adjective, dull, simple, tough, flat) |
| pointless(adjective, dull, weak, flat, stupid) |