The word inexpressive 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: 27
Highest Scoring Words With Friends™ Play In The Letters inexpressive
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Seven Letter Word Alert: (20 words)
enviers, expense, expires, express, inspire, inverse, peevers, penises, pensive, pissier, repines, respins, revises, seepier, snipers, spinier, veinier, veneers, versine, vespers