| staleness(noun, routine, dullness, slowness, feebleness) |
| arduousness(noun, difficulty, toughness, hardness) |
| blues(noun, sorrow, depression, melancholy, sadness) |
| boringness(noun, dullness, monotony) |
| colorlessness(noun, routine, dullness, slowness, feebleness) |
| debilitation(noun, weariness) |
| depression(noun, sorrow, melancholy, sadness, gloom) |
| discontent(melancholy, ennui) |
| dread |
| droopiness(noun, weariness) |
| faintness(noun, weariness) |
| incuriosity(noun, melancholy, dullness, apathy, indifference) |
| joylessness(dullness, monotony) |
| languidness(melancholy, apathy, languor, boredom, world-weariness) |
| lassitude(noun, depression, melancholy, gloom, dullness) |
| long-windedness |
| malaise(depression, gloom, lethargy, slump, sluggishness) |
| painfulness(difficulty, toughness, hardness) |
| repetitiveness(noun, routine, dullness, monotony, flatness) |
| sleepiness(noun, weariness) |