Sentence:  She was frankly disappointed. For some reason she had thought to discover a burglar of one or another accepted type—either a dashing cracksman in full-blown evening dress, <WSD>lithe</WSD>, polished, pantherish, or a common yegg, a red-eyed, unshaven burly brute in the rags and tatters of a tramp. 
Meaning of the word marked with <WSD> tags:  Slim but not skinny.