| slack(adjective, dull, quiet, flat) |
| stagnant(adjective, dull, quiet, flat) |
| subdued(adjective, dull, flat, sad) |
| submissive(adjective, dull, flat, sad) |
| tame(adjective, dull, moderate, flat) |
| time-consuming(adjective, dull, moderate, stiff) |
| unconcerned(adjective, dull, flat, sad) |
| unenthusiastic(adjective, dull, flat, sad) |
| uneventful(adjective, dull, quiet, moderate, flat) |
| unmoved(adjective, dull, flat, sad) |
| unproductive(adjective, dull, moderate, stiff) |
| unprogressive(adjective, dull, moderate, stiff) |
| unpunctual(adjective, dull, stiff, late) |
| zero(adjective, dull, flat, sad) |
| delayed(adjective, dull, late, debilitated) |
| late(adjective, dull, protracted, behind) |
| overdue(adjective, dull, late, protracted) |
| tardy(adjective, dull, late, lazy) |