| jejune(adjective, dull, quiet, weak, flat) |
| lackluster(adjective, dull, weak, simple, flat) |
| languorous(adjective, dull, flat, low, sad) |
| late(adjective, dead, live, living, death) |
| sleepy(adjective, dull, quiet, careless, indifferent) |
| slothful(adjective, dull, quiet, flat, low) |
| static(adjective, calm, dull, quiet, smooth) |
| unmoving(adjective, calm, quiet, still, dead) |
| asleep(adjective, calm, quiet, gentle, indifferent) |
| bland(adjective, dull, weak, boring, feeble) |
| colorless(adjective, dull, weak, simple, soft) |
| colourless |
| gone(adjective, dead, live, death) |
| heavy(adjective, dull, quiet, flat, slow) |
| humdrum(adjective, dull, weak, simple, plain) |
| inorganic(adjective, living, things, organic, inanimate) |
| lackadaisical(adjective, dull, flat, low, sad) |
| stagnant(adjective, calm, quiet, smooth, gentle) |
| stale(adjective, dull, quiet, weak, simple) |
| stiff(adjective, dull, slow, informal, cold) |