buoyant

Synonyms: afloat airy bouncy floatable floating resilient supernatant unsinkable weightless

Antonyms: heavy weighted

Synonyms: animated blithe bouncy breezy bright carefree cheerful debonair effervescent elastic expansive full of zip gay happy invigorated jaunty jovial joyful laid back lighthearted lively peppy resilient sunny supple vivacious

Antonyms: depressed down heavy heavy-hearted