| puts one to sleep(expression, adjective, idiom, dull, boring) |
| recurrent(adjective, dull, flat, boring, tedious) |
| reiterated(adjective, dull, flat, boring, tedious) |
| repetitive(adjective, dull, flat, boring, tedious) |
| run-down |
| same |
| samely(adjective, dull, flat, boring, tedious) |
| sapless(adjective, dull, weak, plain, mild) |
| sing-song(adjective, dull, flat, boring, tedious) |
| somber |
| soporific(adjective, dull, flat, boring, tedious) |
| square(adjective, dull, stupid, ordinary, dry) |
| stale(adjective, stupid, ordinary, commonplace, bland) |
| stereotyped(adjective, stupid, ordinary, commonplace, bland) |
| stock(adjective, stupid, ordinary, commonplace, bland) |
| stupid(adjective, ordinary, commonplace, bland, predictable) |
| subfuse |
| tame(adjective, dull, weak, plain, mild) |
| tasteless undistinctive(expression, adjective, dull, weak, plain) |
| tedious(adjective, dull, weak, simple, plain) |