| Buoyant 1. (a.) Having the quality of rising or floating in a fluid; as a buoyant lifejacket; also, cheerful, as, buoyant spirits; tending to rise or float; as, iron is buoyant in mercury. 2. (v. t. & i.) Bearing up, as a fluid; sustaining another body by being specifically heavier. 3. (v. t. & i.) Light-hearted; vivacious; cheerful; as, a buoyant disposition; buoyant spirits. Thesaurus Entries adaptable, adaptive, afloat, airy, animated, blithe, bouncy, breezy, bright, carefree, cheerful, convalescent, corky, debonair, ebullient, effervescent, elastic, expansive, extensile, flexible, flexile, floatable, floating, floaty, free and easy, jaunty, light, light-hearted, lighthearted, lightsome, lively, peppy, perky, recuperative, recuperatory, resilient, responsive, reviviscent, springy, stretch, stretchable, stretchy, supernatant, vivacious, volatile |