| changeable |
| clean(adjective, simple, flat, plain, ordinary) |
| cloying |
| conventional(adjective, dull, weak, stupid, ordinary) |
| cornfed(adjective, stupid, ordinary, commonplace, puny) |
| daft |
| deadly(adjective, dull, dry, boring, tedious) |
| demonstrative(adjective, soft, tender, sweet, silly) |
| dewy-eyed(adjective, soft, tender, sweet, silly) |
| diddly(adjective, simple, flat, clean, plain) |
| dilute |
| dim(adjective, dull, weak, flat, boring) |
| distasteful(adjective, dull, weak, flat, nasty) |
| double-talk(adjective, value, insignificant, unimportant, empty) |
| doublespeak(adjective, value, insignificant, unimportant, empty) |
| drained(dull, flat, silly, commonplace, stale) |
| dreamy(soft, sweet, indifferent, blank, emotional) |
| drearisome |
| dryasdust |
| dull as dishwater(expression, adjective, idiom, dull, weak) |