The Collaborative International Dictionary of English v.0.48:
layabout \layabout\ n. A person who does no work. Syn: idler, loafer, do-nothing, bum. [WordNet 1.5]WordNet (r) 3.0 (2006):
layabout n 1: person who does no work; "a lazy bum" [syn: idler, loafer, do-nothing, layabout, bum]