Adjective monotonous has 2 senses
  1. monotone, monotonic, monotonous - sounded or spoken in a tone unvarying in pitch; "the owl's faint monotonous hooting"
    Antonyms: melodious, melodic, musical (indirect, via unmelodious)
  2. humdrum, monotonous - tediously repetitious or lacking in variety; "a humdrum existence; all work and no play"; "nothing is so monotonous as the sea"
    Antonym: lively (indirect, via dull)
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