| cloying(adjective, dull, flat, stupid, dead) |
| cold(adjective, cool, detached, blank, sober) |
| cold-blooded(adjective, cool, detached, blank, sober) |
| cold fish(expression, adjective, cool, flat, detached) |
| colorless(adjective, dull, simple, plain, stupid) |
| common(adjective, dull, simple, moderate, plain) |
| conventional(adjective, stupid, ordinary, commonplace, bland) |
| cool(adjective, detached, blank, sober, unfeeling) |
| cool cat(expression, adjective, cool, detached, blank) |
| cornball(adjective, stupid, ordinary, commonplace, puny) |
| cornfed(adjective, stupid, ordinary, commonplace, puny) |
| corny(adjective, stupid, ordinary, commonplace, bland) |
| darkness(noun, extinction, obscurity) |
| dead(adjective, dull, simple, plain, stupid) |
| deadpan(adjective, cool, flat, detached, blank) |
| demanding(adjective, dull, boring, tedious, irritating) |
| depressing(adjective, dull, boring, tedious, dreary) |
| detached(adjective, cool, blank, sober, unfeeling) |
| diddly(adjective, bad, simple, clean, plain) |
| difficult(adjective, dull, boring, tedious, irritating) |