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

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