| frustrate(verb, stop, dull, quiet, reduce) |
| lag(verb, time, help, cause, delay) |
| lessen(verb, stop, calm, control, dull) |
| let up(verb, expression, phrasal verb, stop, calm) |
| non-punctual |
| ponderous(adjective, dull, lazy, unhurried) |
| relax(verb, calm, reduce, release, delay) |
| slow-witted(adjective, dull, simple, ability, mind) |
| soft(adjective, calm, quiet, increase, light) |
| stagnant(adjective, dull, quiet, flat, heavy) |
| steady(adjective, regular) |
| tardily |
| thick-witted(adjective, dull, stupid) |
| thickheaded |
| time-consuming(adjective, late, debilitated, protracted, behind) |
| weak-minded(adjective, dull, simple, ability, mind) |
| bar(verb, stop, control, reduce, restrain) |
| calm(verb, adjective, control, quiet, light) |
| cloddish(adjective, dull) |
| defer(verb, hold, delay, put, suspend) |