| wearying(adjective, dull, boring, tedious, irritating) |
| routine(noun, adjective, dull, quiet, weak) |
| recurrent(adjective, dull, regular, normal, continuous) |
| repetitive(adjective, dull, flat, ordinary, dry) |
| unexciting(adjective, dull, quiet, weak, flat) |
| uniform(adjective, dull, quiet, soft, gentle) |
| even(adjective, calm, quiet, soft, reasonable) |
| continual(adjective, dull, steady, stable, regular) |
| ho-hum(adjective, dull, simple, plain, ordinary) |
| jejune(adjective, dull, weak, flat, ordinary) |
| monotone(noun, adjective, dull, dark, gloomy) |
| soporific(adjective, dull, flat, ordinary, dry) |
| unchanging(adjective, dull, cold, steady, stable) |
| vapid(adjective, dull, weak, simple, flat) |
| unvaried(adjective, dull, simple, stupid, ordinary) |
| bland(adjective, dull, quiet, weak, soft) |
| common(adjective, ordinary, boring, dull, flat) |
| constant(adjective, dull, regular, boring, fixed) |
| habitual(adjective, simple, cold, ordinary, familiar) |
| invariable(adjective, quiet, soft, gentle, flat) |