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Adjective: monotonous  mu'nó-tu-nus or mu'nót-nus
  1. Tediously repetitious or lacking in variety
    "nothing is so monotonous as the sea";
    - humdrum
  2. Sounded or spoken in a tone unvarying in pitch
    "the owl's faint monotonous hooting";
    - flat, monotone, monotonic
  3. (mathematics) of a sequence or function; consistently increasing and never decreasing or consistently decreasing and never increasing in value
    - monotonic, monotone

See also: decreasing monotonic, dull, hebetudinous [rare], increasing monotonic, unmodulated

Encyclopedia: Monotonous