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1. Sounded or spoken in an unvarying tone: a monotonous droning voice.
2. Tediously repetitious or lacking in variety. See Synonyms at boring.

[From Greek monotonos : mono-, mono- + tonos, tone; see tone.]

mo·not′o·nous·ly adv.
mo·not′o·nous·ness n.
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A tiresome lack of variety:
References in classic literature ?
Without any objective change whatever, variety had taken the place of monotonousness. His host and his host's household, his men and his maids, as they became intimately known to Clare, began to differentiate themselves as in a chemical process.
There is a profound monotonousness about its facts that baffles and defeats one's sincerest efforts to make them sparkle and enthuse.
Because he sang it, she liked its inanity and monotonousness; and most of all, it seemed to her, she loved his hopeless and adorable flatting of every note.