| square(adjective, dull, simple, flat, clean) |
| unexciting(adjective, dull, weak, plain, mild) |
| wearisome(adjective, dull, simple, ordinary, familiar) |
| blah(adjective, dull, weak, simple, plain) |
| cookie-cutter(adjective, characteristic, quality, normalcy, customariness) |
| empty(adjective, ineffective, fruitless) |
| flavorless(adjective, dull, weak, plain, mild) |
| hackney |
| ho-hum(adjective, dull, simple, flat, clean) |
| lifeless |
| mean(adjective, mediocre) |
| mild(adjective, dull, weak, plain, innocent) |
| milk-and-water(adjective, dull, weak, plain, mild) |
| petty |
| piddling(adjective, unimportant) |
| plain(adjective, dull, weak, simple, unpleasant) |
| prose(adjective, simple, flat, clean, plain) |
| repetitious(adjective, dull, hard, tired, old) |
| tasteless(adjective, dull, hard, weak, plain) |
| trifling(adjective, unimportant) |