monotony

Noun
  1. The quality of wearisome constancy, routine, and lack of variety (synset 104747566)
    "he had never grown accustomed to the monotony of his work"; "he was sick of the humdrum of his fellow prisoners"; "he hated the sameness of the food the college served"
  2. Constancy of tone or pitch or inflection (synset 104746775)

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