monotonousness

a tedious lack of variety detested the mind-numbing monotonousness of the task but knew that it had to be done Synonyms humdrum, monotone, monotony, samenessRelated Words uniformity; blahs, boredom, drabness, dullness (also dulness), ennui, restlessness, tediousness, tedium, tiresomeness, weariness, wearisomenessNear Antonyms diversity, multiplicity, variety; variability, variation; absorption, engagement, engrossment, enthrallment, fascination, grip, interest, intrigue, involvement; animation, enlivenment, excitement, invigoration, stimulation