| boring(adjective, dull, quiet, weak, flat) |
| dull(adjective, weak, plain, mild, stupid) |
| uninteresting(adjective, dull, weak, plain, mild) |
| prosaic(adjective, dull, weak, stupid, ordinary) |
| humdrum(adjective, dull, weak, plain, informal) |
| monotonous(adjective, dull, quiet, weak, flat) |
| tedious(adjective, dull, weak, plain, mild) |
| dreary(adjective, dull, heavy, ordinary, dry) |
| flat(adjective, dull, quiet, weak, slow) |
| tiresome(adjective, dull, stupid, dry, boring) |
| bland(adjective, dull, weak, plain, mild) |
| dead(adjective, dull, quiet, flat, slow) |
| ordinary(adjective, dull, plain, indifferent, modest) |
| tame(adjective, dull, weak, plain, mild) |
| dry(adjective, dull, flat, boring, tedious) |
| insipid(adjective, dull, weak, plain, mild) |
| unstimulating(adjective, dull, weak, plain, mild) |
| vapid(adjective, dull, weak, plain, mild) |
| wearisome(adjective, dull, weak, stupid, boring) |
| common(adjective, dull, ordinary, modest, dry) |