| comformable(adjective, simple, ordinary, familiar, natural) |
| commonly known |
| constant |
| consuetudinary |
| copybook |
| cornball(adjective, dull, set, flat, silly) |
| cornfed(adjective, stupid, ordinary, commonplace, bland) |
| daily(adjective, simple, ordinary, familiar, natural) |
| destroyed(adjective, sad, gloomy, miserable, down) |
| dismal(adjective, dull, flat, sad, gloomy) |
| doleful(adjective, sad, gloomy, miserable, down) |
| dolorous(adjective, sad, gloomy, miserable, down) |
| drab(adjective, dull, hard, simple, flat) |
| dreary(adjective, dull, simple, flat, unpleasant) |
| driveling(adjective, dull, flat, stupid, ordinary) |
| droopy(adjective, sad, gloomy, miserable, down) |
| dull as dishwater(expression, adjective, idiom, dull, simple) |
| dumb(adjective, stupid, ordinary, commonplace, bland) |
| dusty(adjective, dull, hard, simple, boring) |
| effete(adjective, dull, hard, old, sour) |