| dinginess(noun, darkness, plainness, dirtiness, drabness) |
| dispassion(noun, disregard, apathy, indifference, calmness) |
| dull(noun, adjective, grayness) |
| dumbness |
| dusk(noun, shade, darkness, dimness) |
| emotionlessness(noun, disregard, apathy, indifference, calmness) |
| fatigue(noun, melancholy, apathy, indifference, discontent) |
| gray(noun, grayness) |
| impassivity(noun, disregard, apathy, inactivity, indifference) |
| insentience(noun, insensibility) |
| monotonousness(noun, routine, tedium, monotony, flatness) |
| oafishness |
| passiveness(noun, disregard, apathy, inactivity, indifference) |
| somnolence(noun, inactivity, lethargy, daze, slumber) |
| staleness(noun, routine, slowness, tedium, feebleness) |
| sterility(noun, excite, lack, routine, slowness) |
| thick-wittedness |
| tiresomeness(noun, melancholy, routine, apathy, indifference) |
| unresponsiveness(noun, disregard, apathy, inactivity, indifference) |
| ashiness(noun, grayness) |