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Adjective: cheerful  cheer-ful
  1. Being full of or promoting cheer; having or showing good spirits
    "her cheerful nature"; "a cheerful greeting"; "a cheerful room"; "as cheerful as anyone confined to a hospital bed could be"
  2. Pleasantly (even unrealistically) optimistic
    - pollyannaish, upbeat, Pollyannaish

See also: beaming, beamish, blithe, blithesome [archaic], buoyant, cheer, cheerfulness, cheery, chipper, chirpy [informal], debonair, debonaire, gay, glad, happy, jaunty, lighthearted, light-hearted, lightsome, optimistic, perky, playful, smiley, smiling, sunniness, sunny, sunshine, sunshiny, twinkly, unserious

Antonym: uncheerful

Encyclopedia: Cheerful