| monotonous(adjective, dull, stupid, boring, tedious) |
| moth-eaten(adjective, dull, flat, stupid, dead) |
| nowhere(adjective, dull, stupid, boring, tedious) |
| onerous(adjective, dull, boring, tired, tedious) |
| oppressive(adjective, dull, boring, tired, tedious) |
| plebeian(adjective, dull, flat, stupid, dead) |
| prosaic(adjective, dull, flat, stupid, boring) |
| repetitious(adjective, dull, flat, stupid, dead) |
| routine(adjective, dull, flat, stupid, dead) |
| slaving |
| slogging |
| spiritless(adjective, dull, flat, stupid, dead) |
| stodgy(adjective, dull, flat, stupid, dead) |
| straining |
| strenuous(adjective, dull, boring, tired, tedious) |
| striving |
| struggling |
| stuffy(adjective, dull, flat, stupid, dead) |
| tame(adjective, dull, flat, stupid, dead) |
| threadbare(adjective, dull, flat, stupid, dry) |