Lean stresses lack of fat and of curving contours. What's the skinny on their supposed breakup See examples of skinny used in a sentence.
Skinny (comparative skinnier, superlative skinniest) (informal) thin, generally in a negative sense (as opposed to slim, which is thin in a positive sense).
There are 14 meanings listed in oed's entry for the word skinny, three of which are labelled obsolete
See ‘meaning & use’ for definitions, usage, and quotation evidence. Definition of skinny adjective from the oxford advanced learner's dictionary (comparative skinnier, superlative skinniest) (informal, usually disapproving) very thin, especially in a way that you find unpleasant or ugly He was such a skinny kid
She had wild hair and long skinny arms. (of an object) narrow or slender Here's the skinny on the latest hollywood scandal. You might order a skinny coffee drink at a cafe, meaning you'd like it to be made with skim milk.