Tending to float on a liquid or rise in air or gas:
— Buoyant balloons.
— Buoyant balsawood boats.

synonym: floaty.

Roget 858: hoping etc. v.; in hopes etc. n.; hopeful, confident; secure etc. (certain) 484; sanguine, in good heart, buoyed up, buoyant, elated, flushed, exultant, enthusiastic; heartsome^†; utopian.    unsuspecting, unsuspicious; fearless, free from fear, free from suspicion, free from distrust, free from despair, exempt from fear, exempt from suspicion, exempt from distrust, exempt from despair; undespairing^†, self reliant.    probable, on the high road to; within sight of shore, within sight of land; promising, propitious; of promise, full of promise; of good omen; auspicious, de bon augure [Fr.]; reassuring; encouraging, cheering, inspiriting, looking up, bright, roseate, couleur de rose [Fr.], rose-colored.    ... show more

Roget 305: rising etc. v.. scandent^†, buoyant; supernatant, superfluitant^†; excelsior.   

Roget 320: light, subtile, airy; imponderous^†, imponderable; astatic^†, weightless, ethereal, sublimated; gossamery; suberose^†, suberous^†; uncompressed, volatile; buoyant, floating etc. v.; portable.    light as a feather, light as a thistle, light as air; lighter than air; rise like a balloon, float like a balloon ... show more

Roget 325: elastic, flexible, tensile, spring, resilient, renitent, buoyant; ductile, stretchable, extendable.   

Roget 734: prosperous; thriving etc. v.; in a fair way, buoyant; well off, well to do, well to do in the world; set up, at one's ease; rich etc. 803; in good case; in full, in high feather; fortunate, lucky, in luck; born with a silver spoon in one's mouth, born under a lucky star; on the sunny side of the hedge.    auspicious, propitious, providential.    palmy, halcyon; agreeable etc. 829; couleur de rose [Fr.].    ... show more

Roget 836: cheerful; happy etc. 827; cheery, cheerly^†; of good cheer, smiling; blithe; in spirits, in good spirits; breezy, bully, chipper [U.S.]; in high spirits, in high feather; happy as the day is long, happy as a king; gay as a lark; allegro; debonair; light, lightsome, light hearted; buoyant, debonnaire, bright, free and easy, airy; janty^†, jaunty, canty^†; hedonic^†; riant^†; sprightly, sprightful^†; spry; spirited, spiritful^†; lively, animated, vivacious; brisk as a bee; sparkling, sportive; full of play, full of spirit; all alive.    sunny, palmy; hopeful etc. 858.    merry as a cricket, merry as a grig^†, merry as a marriage bell; joyful, joyous, jocund, jovial; jolly as a thrush, jolly as a sandboy^†; blithesome; gleeful, gleesome^†; hilarious, rattling.    winsome, bonny, hearty, buxom.    playful, playsome^†; folatre [Fr.], playful as a kitten, tricksy^†, frisky, frolicsome; gamesome; jocose, jocular, waggish; mirth loving, laughter-loving; mirthful, rollicking.    elate, elated; exulting, jubilant, flushed; rejoicing etc. 838; cock-a-hoop.    cheering, inspiriting, exhilarating; cardiac, cardiacal^†; pleasing etc. 829; palmy.    ... show more

Characterized by liveliness and lightheartedness:
— Buoyant spirits.

synonyms: chirpy, perky.