| cold |
| colloquial(adjective, simple, ordinary, familiar, natural) |
| comformable(adjective, simple, ordinary, familiar, natural) |
| connatural |
| continuous |
| conventional(adjective, simple, ordinary, familiar, natural) |
| current(adjective, simple, ordinary, familiar, natural) |
| daily(adjective, simple, ordinary, familiar, natural) |
| determined |
| dim(adjective, dull, boring, routine, tedious) |
| dime a dozen(expression, adjective, idiom, dull, boring) |
| drab(adjective, dull, stupid, boring, routine) |
| drag(adjective, dull, flat, stupid, dead) |
| dragger(adjective, dull, bad, stupid, disagreeable) |
| drear(adjective, dull, bad, flat, dry) |
| dreary(adjective, dull, boring, routine, tedious) |
| drudging(adjective, dull, flat, stupid, dead) |
| dull as dishwater(expression, adjective, idiom, dull, boring) |
| durable |
| enervated |