The word disbelievingly 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 disbelievingly
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Seven Letter Word Alert: (49 words)
bedevil, bedvein, bellied, bellies, belling, billing, blindly, bylined, bylines, deleing, delving, densely, deveins, dingies, dingily, divines, divings, dyeings, dyeline, edibles, eleidin, eliding, endives, eyelids, legends, legible, legibly, levying, libeled, linseed, livened, lividly, livings, needily, seedily, seeding, selling, sibling, sidling, sieving, singled, sliding, snidely, sylvine, veiling, visible, visibly, yeelins, yelling