The word unmarketable is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 25
Highest Scoring Words With Friends™ Plays In The Letters unmarketable
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Seven Letter Word Alert: (45 words)
abluent, albumen, alumnae, amateur, banaler, beamlet, beermat, blanket, bleaker, bleater, blunter, brumate, eatable, emanate, emulant, emulate, enabler, enteral, eternal, knaurle, maleate, manatee, meerkat, mutable, natural, nebulae, nebular, neutral, numeral, nutmeal, reblame, reblent, retaken, tableau, tabular, tamable, tenable, tremble, tumbler, tunable, unabate, unalert, unalter, unbrake, unmaker