| sluggish(adjective, dull, quiet, increase, weak) |
| dull(verb, adjective, stop, upset, characteristic) |
| stupid(adjective, characteristic, dull, simple, flat) |
| hinder(verb, stop, control, reduce, restrain) |
| delay(verb, time, help, reduce, cause) |
| lazy(adjective, dull, weak, easy, relaxed) |
| retard(verb, control, dull, time, quiet) |
| impede(verb, stop, control, reduce, restrain) |
| inactive(adjective, action, dull, quiet, cool) |
| slack(verb, adjective, calm, dull, quiet) |
| lethargic(adjective, state, dull, quiet, weak) |
| torpid(adjective, characteristic, dull, quiet, weak) |
| dense(adjective, characteristic, dull, simple, heavy) |
| leisurely(adjective, calm, dull, quiet, light) |
| listless(adjective, state, dull, quiet, cool) |
| slothful(adjective, dull, quiet, flat, careless) |
| backward(adjective, adverb, dull, time, simple) |
| obstruct(verb, stop, control, reduce, restrain) |
| tardy(adjective, adverb, dull, careless, indifferent) |
| check(verb, stop, control, dull, quiet) |