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Adjective: buoyant  boy-unt
  1. Tending to float on a liquid or rise in air or gas
    "buoyant balloons";
    - floaty
  2. Characterized by liveliness and lightheartedness
    "buoyant spirits";
    - chirpy [informal], perky

See also: cheerful, light, zappy [informal]

Encyclopedia: Buoyant, Alberta