Meagerly slim; attenuated; lean; gaunt: as, a tall, lank man.Loose or lax and yielding readily to pressure; not distended; shrunken; shriveled: as, a lank sack or purse.Straight and flat, as hair.Languid; drooping.n. Lankness; leanness.To grow or become lank or thin.n. The groin.