Moving easily and quickly; nimble:
— A lightsome buoyant step.

synonyms: light, tripping.

Roget 420: shining etc. v.; luminous, luminiferous^†; lucid, lucent, luculent^†, lucific^†, luciferous; light, lightsome; bright, vivid, splendent^†, nitid^†, lustrous, shiny, beamy^†, scintillant^†, radiant, lambent; sheen, sheeny; glossy, burnished, glassy, sunny, orient, meridian; noonday, tide; cloudless, clear; unclouded, unobscured^†.    gairish^†, garish; resplendent, transplendent^†; refulgent, effulgent; fulgid^†, fulgent^†; relucent^†, splendid, blazing, in a blaze, ablaze, rutilant^†, meteoric, phosphorescent; aglow.    bright as silver; light as day, bright as day, light as noonday, bright as noonday, bright as the sun at noonday.    actinic; photogenic, graphic; heliographic; heliophagous^†.    ... show more

Roget 605: irresolute, infirm of purpose, double-minded, half-hearted; undecided, unresolved, undetermined; shilly-shally; fidgety, tremulous; hesitating etc. v.; off one's balance; at a loss etc. (uncertain) 475.    vacillating etc. v.; unsteady etc. (changeable) 149; unsteadfast^†, fickle, without ballast; capricious etc. 608; volatile, frothy; light, lightsome, light-minded; giddy; fast and loose.    weak, feeble-minded, frail; timid, wimpish, wimpy etc. 860; cowardly etc. 862; dough-faced [U.S.]; facile; pliant etc. (soft) 324; unable to say 'no', easy-going revocable, reversible.    ... show more

Carefree and happy and lighthearted:
— Trilling songs with a lightsome heart.

synonyms: blithe, blithesome, light-hearted, lighthearted.

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