| treadmill(noun, adjective, boring, uneventful) |
| trivial(adjective, mean, simple, lower, obscure) |
| unexceptional(adjective, dull, simple, moderate, clean) |
| unoriginal(adjective, dull, moderate, stupid, ordinary) |
| unromantic |
| bald |
| bromidic(adjective, dull, stupid, ordinary, boring) |
| cookie-cutter(adjective, characteristic, quality, regularity, commonplaceness) |
| corny(adjective, dull, common, stupid, ordinary) |
| customary(adjective, moderate, common, ordinary, usual) |
| drag(adjective, dull, stupid, boring, tedious) |
| dull as dishwater(expression, adjective, idiom, dull, weak) |
| dullness(noun, routine, tedium, monotony, flatness) |
| fatigue |
| gray |
| hack |
| ho hum(expression, adjective, dull, weak, flat) |
| homely(adjective, simple, ordinary, familiar, natural) |
| invariability(noun, routine, dullness, likeness, tedium) |
| irk |