The word unexpressible 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: 29
Highest Scoring Words With Friends™ Play In The Letters unexpressible
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Seven Letter Word Alert: (54 words)
beeline, beepers, bleeper, blesser, bruises, enbuses, ensures, expense, expires, express, expulse, insures, leisure, lineups, lispers, lupines, peelers, penises, peruses, pieless, pinless, puerile, pulsers, punless, purines, purlins, pussier, rebless, reexpel, reissue, relines, repeels, repiles, repines, replies, repulse, resnubs, respins, ribless, seepier, sleeper, snipers, spinels, spinule, spleens, splines, suberin, sunrise, suspire, unbless, unreels, uprisen, uprises, xeruses