- buoyant, floaty - tending to float on a liquid or rise in air or gas; "buoyant balloons"; "buoyant balsawood boats"; "a floaty scarf"
Antonym: heavy (indirect, via light)
- buoyant, chirpy, perky - characterized by liveliness and light-heartedness; "buoyant spirits"; "his quick wit and chirpy humor"; "looking bright and well and chirpy"; "a perky little widow in her 70s"
Antonyms: cheerless, uncheerful (indirect, via cheerful)