Something that is buoyant floats in water. Since floating is happier than sinking, buoyant also refers to things are fun and upbeat.

Someone with a buoyant personality is fun to be around, laughs a lot, smiles, and cheers other people up. Buoyant people are lively and lighthearted — the opposite of sad, depressed, and bummed out. Buoyant people are also called bubbly and cheerful, and it should help to remember that buoyant objects float — just like a buoyant person can seem like they're floating too (as in the expression "floating on air").

Definitions of buoyant

adj tending to float on a liquid or rise in air or gas

buoyant balloons”
buoyant balsawood boats”
of comparatively little physical weight or density

adj characterized by liveliness and lightheartedness

buoyant spirits”
chirpy, perky
being full of or promoting cheer; having or showing good spirits

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