Meaning

adjective showing a high degree of refinement and the assurance that comes from wide social experience

adjective moving and bending with ease

adjective being of delicate or slender build; - Frank Norris

originBorrowed from French svelte, from Italian svelto (“stretched out”), past participle of svellere (“to pluck out, root out”), from Vulgar Latin *exvellere, from ex + vellere (“to pluck, stretch”).

Etymology from Wiktionary, CC BY-SA 3.0