The word impressively 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™ Play In The Letters impressively
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Seven Letter Word Alert: (42 words)
empires, empress, epimers, imperil, implies, impress, lispers, messier, messily, miserly, misrely, missile, pieless, pissier, prelims, premise, premiss, relives, repiles, replies, reviles, revises, rimless, servile, silvers, silvery, similes, simpers, simpler, simples, slimier, slivers, smilers, smileys, smilier, veilers, veilier, verisms, vermeil, vespers, yelmers, yelpers