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Adjective: mirthful  murth-ful
  1. Full of or showing high-spirited merriment
    "a mirthful laugh";
    - gay, jocund [formal], jolly, jovial, merry
  2. Arousing or provoking laughter
    "a mirthful experience";
    - amusing, comic, comical, funny, laughable, risible, rib-tickling [informal]

See also: humorous, humourous [Brit, Cdn, non-standard], joyous