The word unacknowledged 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: 32
Highest Scoring Words With Friends™ Play In The Letters unacknowledged
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Seven Letter Word Alert: (60 words)
angulon, candled, caulked, clanged, clanked, cleaned, cloaked, clonked, clouded, clowned, clunked, congeal, cudweed, daglock, dangled, decagon, decalog, decoked, deluged, dockage, doweled, dungeon, dunnock, educand, encoded, endogen, endowed, genlock, geoduck, gladden, glanced, gleaned, gunlock, kneaded, leagued, lounged, nanogel, noduled, nongeek, nonlake, nonlead, nuanced, nucleon, uncaged, uncaked, unclean, uncloak, uncoded, unedged, unended, unlaced, unladen, unowned, unwaged, unwedge, wakened, wangled, waulked, wedlock, wounded