The word unaddressed 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: 16
Highest Scoring Words With Friends™ Plays In The Letters unaddressed
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Seven Letter Word Alert: (32 words)
addends, address, assured, asunder, danders, deadend, deadens, denuded, denuder, denudes, desands, dreaded, dresden, dressed, endears, endured, endures, ensears, ensured, ensures, readded, reddens, redness, resands, resends, saddens, sanders, senders, suddens, sundaes, undress, ureases