| insipid(adjective, dull, weak, simple, plain) |
| lackluster |
| lusterless |
| matter-of-fact(adjective, dull, simple, dry, boring) |
| matter of fact(expression, adjective, idiom, simple, puny) |
| milk-and-water(adjective, dull, weak, plain, mild) |
| monotonous(adjective, dull, weak, simple, plain) |
| muddy |
| mundane(adjective, dull, stupid, ordinary, boring) |
| murky |
| nerdy(adjective, dull, weak, plain, mild) |
| noplace(adjective, stupid, ordinary, commonplace, puny) |
| nowhere(adjective, stupid, ordinary, commonplace, puny) |
| old hat(expression, adjective, stupid, ordinary, commonplace) |
| ordinary(adjective, dull, stupid, boring, commonplace) |
| pabulum(adjective, dull, weak, plain, mild) |
| pedestrian(adjective, dull, stupid, ordinary, boring) |
| plain(adjective, dull, weak, simple, mild) |
| platitudinous(adjective, stupid, ordinary, commonplace, bland) |
| prosaic(adjective, dull, flat, ordinary, boring) |