The Collaborative International Dictionary of English v.0.48:
Unmerchantable \Un*mer"chant*a*ble\, a. (Com.) Not merchantable; not fit for market; being of a kind, quality, or quantity that is unsalable. --McElrath. [1913 Webster]WordNet (r) 3.0 (2006):
unmerchantable adj 1: not fit for sale [syn: unmarketable, unmerchantable, unvendible]