The Collaborative International Dictionary of English v.0.48:
paperbacked \pa"per*backed\ (p[=a]"p[~e]r*b[a^]kt`), adj. 1. same as paperback. Syn: paperback. [WordNet 1.5] paperboyWordNet (r) 3.0 (2006):
paperbacked adj 1: (of books) having a flexible binding [syn: paperback, paperbacked]