| heavy(adjective, dull, quiet, slow, weary) |
| ho-hum(adjective, dull, flat, boring, tedious) |
| hollow(adjective, dull, uninteresting, lackluster, unexciting) |
| inactive(adjective, action, dull, quiet, flat) |
| inane(adjective, dull, weak, dead, tedious) |
| insipid(adjective, dull, weak, simple, boring) |
| languid(adjective, dull, quiet, flat, low) |
| leaden(adjective, dull, flat, slow, heavy) |
| lethargic(adjective, dull, quiet, slow, heavy) |
| listless(adjective, dull, quiet, flat, low) |
| nodding(adjective, quiet, slow, heavy, sleepy) |
| pale |
| pointless(adjective, dull, weak, dead, tedious) |
| poky(adjective, dull, boring, dreary, monotonous) |
| sleepy(adjective, dull, quiet, low, slow) |
| slothful(adjective, dull, quiet, flat, low) |
| somnifacient(adjective, quiet, slow, heavy, sleepy) |
| somnolent(adjective, dull, quiet, slow, heavy) |
| stiff(adjective, dull, moderate, low, slow) |
| tasteless(adjective, dull, weak, dead, tedious) |