buoyant

Adjective
  1. Tending to float on a liquid or rise in air or gas (synset 301190615)
    "buoyant balloons"; "buoyant balsawood boats"; "a floaty scarf"
  2. Characterized by liveliness and lightheartedness (synset 300364701)
    "buoyant spirits"; "his quick wit and chirpy humor"; "looking bright and well and chirpy"; "a perky little widow in her 70s"

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