出典:Wiktionary
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”).
svelte (comparative svelter, superlative sveltest)
Used mainly as a compliment, whereas words like thin, scrawny and skinny could be used in negative connotations.