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Adjective: humorless  hyoo-mur-lus
Usage: US (elsewhere: humourless)
  1. Lacking humor
    "it was a humorless wink; a wink of warning";
    - humourless [Brit, Cdn], unhumorous

See also: po-faced [Brit, informal], sobersided [N. Amer], unamusing, unfunny

Antonym: humorous

Encyclopedia: Humorless