Lissom

Now, our country lads, [...] are so much better made, so much more athletic, and yet so much lissomer—to use a Hampshire phrase, which deserves at least to be good English.

Source: wiktionary

A brig you see, sir, is much more laboursome in a gale of wind. A Schooner is much lissomer built.

Source: wiktionary

[T]he most striking object was the long array of shoes and boots of all lengths, breadths, and thicknesses; high-lows, low-highs, lace-ups, mud-boots, waders, and snow-boots. If they were not waterproof, as they professed to be, the only question was, as it appeared to me, how they ever got dry and lissome again, when they were once wet.

Source: wiktionary

[Y]onder sly old trout has seen too much of us; there, taking advantage of an escort of the smaller fry, he's off while we speak; and one flap of his lissom tail has carried him ten yards away: [...]

Source: wiktionary