| silence(extinction, obscurity) |
| spiritless(adjective, dull, flat, stupid, dead) |
| square(adjective, simple, clean, plain, stupid) |
| stereotyped(adjective, dull, stupid, ordinary, tedious) |
| stock(adjective, stupid, ordinary, commonplace, bland) |
| stodgy(adjective, dull, flat, stupid, dead) |
| stony-eyed(adjective, cool, flat, detached, blank) |
| strenuous(adjective, dull, boring, tedious, irritating) |
| stuffy(adjective, dull, flat, stupid, dead) |
| stupid(adjective, dull, ordinary, boring, tedious) |
| thick-skinned(adjective, cool, detached, blank, sober) |
| thin(adjective, dull, weak, flat, boring) |
| threadbare(adjective, dull, flat, stupid, dry) |
| tired(adjective, dull, stupid, ordinary, boring) |
| tiring(adjective, dull, stupid, boring, tedious) |
| tolerable(adjective, moderate, usual, regular, normal) |
| toneless(adjective, cool, flat, detached, blank) |
| too much(expression, adjective, dull, boring, tedious) |
| tough(adjective, dull, boring, tedious, irritating) |
| tripe(adjective, stupid, ordinary, commonplace, bland) |