buoyant

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
  1. adjective
    tending to float on a liquid or rise in air or gas
    buoyant balloons”
    buoyant balsawood boats”
    synonyms: floaty
    light
    of comparatively little physical weight or density
  2. adjective
    characterized by liveliness and lightheartedness
    buoyant spirits”
    synonyms: chirpy, perky
    cheerful
    being full of or promoting cheer; having or showing good spirits
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