Etymology
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buoyant (adj.)

1570s, perhaps from Spanish boyante, present participle of boyar "to float," from boya "buoy," from Dutch boei (see buoy (n.)). Of personalities, etc., from c. 1748. Related: Buoyantly.

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Definitions of buoyant

buoyant (adj.)
tending to float on a liquid or rise in air or gas;
buoyant balloons
buoyant balsawood boats
Synonyms: floaty
buoyant (adj.)
characterized by liveliness and lightheartedness;
buoyant spirits
Synonyms: chirpy / perky
From wordnet.princeton.edu