The word expressionless 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: 26
Highest Scoring Words With Friends™ Plays In The Letters expressionless
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Seven Letter Word Alert: (66 words)
elopers, epoxies, epsilon, expense, expires, explore, exposer, exposes, express, insoles, lesions, lessees, lessens, lessons, lessors, lioness, lispers, lossier, openers, osseins, oxslips, peelers, penises, peonies, persons, pieless, pinless, pioneer, pleions, plexors, poesies, possess, presses, prisons, proline, proxies, reexpel, relines, reopens, repeels, repiles, repines, replies, reposes, resoils, resoles, respins, seepier, seniors, sensors, sessile, session, sexless, sinless, sleeper, slopers, snipers, soirees, sonless, spinels, spinose, spleens, splines, spoiler, xeroses, xerosis