"buoyant" in the adjective sense
1. buoyant, floaty
tending to float on a liquid or rise in air or gas
"buoyant balloons"
"buoyant balsawood boats"
"a floaty scarf"
2. buoyant, chirpy, perky
characterized by liveliness and lightheartedness
"buoyant spirits"
"his quick wit and chirpy humor"
"looking bright and well and chirpy"
"a perky little widow in her 70s"
Source: WordNet® (An amazing lexical database of English)
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