slender, slight, slim, svelte
Meaning: being of delicate or slender build; "she was slender as a willow shoot is slender"- Frank Norris; "a slim girl with straight blonde hair"; "watched her slight figure cross the street"
lissome, lissom, lithe, lithesome, slender, supple, svelte, sylphlike
Meaning: moving and bending with ease
polished, refined, svelte, urbane
Meaning: showing a high degree of refinement and the assurance that comes from wide social experience; "his polished manner"; "maintained an urbane tone in his letters"
A good half of the station crowd was already staring at them, torn between horrified pity and riotous mirth, and as Phyllis, with her svelte jaw dropping, approached, the pair bent over and emitted a college cheer in loud, far-carrying voices, thoughtfully adding the name "Phyllis" to the end.