The word unaccustomed 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 unaccustomed
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Seven Letter Word Alert: (47 words)
accents, account, accused, acnodes, acumens, amounts, astound, autumns, coacted, coasted, conduce, conduct, consume, costume, counted, daemons, deacons, decants, decocts, decuman, demount, descant, donates, ductase, dustman, dustmen, duteous, endmost, mounted, mucosae, muscone, nutcase, octanes, outmans, sanctum, sconced, scouted, snouted, tacnode, tandems, tenuous, toucans, uncased, unmated, unmates, unsated, untamed