Douglas Harper's Etymology Dictionary
1650s, from un- (1) "not" + marketable (adj.).
Wiktionary
a. Not marketable
WordNet
adj. not fit for sale [syn: unmerchantable, unvendible]
not capable of being sold
Usage examples of "unmarketable".
People who said that Bradley was unmarketable as a boyfriend and husband would just have to eat their words with a fork and spoon from now on.
Poverty comes pleading, not for charity, for the most part, but imploring us to find a purchaser for its unmarketable wares.
Like thrifty artists, we must paint out the unmarketable picture, and call luckier creations to fill up the same canvas!
I have never agreed to pay for favours I received, in coin not of the currency, or jewels of unmarketable value.
He was now friends with unmarketable degree types who waxed lyrical about art movies.
But now he was old and exhausted and did not know current fashions and modern tastes, and whenever he did manage to concoct a new perfume of his own, it was some totally old-fashioned, unmarketable stuff that within a year they had to dilute ten to one and peddle as an additive for fountains.
The selling of the cattle and the various effects realized only enough to discharge the liabilities, and when this had been done Dave found himself with a considerable area of unmarketable land, a considerable bundle of paid bills, and his horse, saddle and revolver.