| soporific(noun, adjective, quiet, dry, boring) |
| uninspired(adjective, set, flat, silly, common) |
| cloudy(adjective, obscure, dark, gloomy, miserable) |
| faint(verb, adjective, quiet, reduce, light) |
| fatuous(adjective, silly, foolish, stupid, crazy) |
| ho-hum(adjective, simple, flat, plain, ordinary) |
| indistinct(adjective, quiet, weak, soft, gentle) |
| mundane(adjective, boring, simple, ordinary, tedious) |
| plain(adjective, weak, simple, tough, flat) |
| sad(adjective, unhappy, dark, black, gloom) |
| soften(verb, action, quiet, check, reduce) |
| spiritless(adjective, quiet, weak, kind, soft) |
| stale(adjective, set, hard, weak, simple) |
| benumb(verb, action, quiet, diminish, impair) |
| colorless(adjective, beat, light, weak, simple) |
| damp(verb, adjective, upset, trouble, quiet) |
| indifferent(adjective, calm, quiet, mean, flat) |
| insensitive(noun, adjective, quiet, rough, low) |
| lethargic(adjective, calm, flat, slow, careless) |
| phlegmatic(adjective, calm, tough, slow, relaxed) |