Sentence:  Even when with heavy / Plume and pall / The <WSD>sleeky</WSD> coaches roll by, / Coffin, flowers and all, / He laughs, for he sees / Crouched on the coffin a small / Yellowy shape go by&mdash; / Death, uneasy and melancholy. 
Meaning of the word marked with <WSD> tags:  sleek; slick