The word uncloudedness 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: 23
Highest Scoring Words With Friends™ Play In The Letters uncloudedness
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Seven Letter Word Alert: (39 words)
clouded, coddles, consuls, coulees, counsel, cuddles, decodes, deduces, delouse, deludes, denudes, descend, enclose, encoded, encodes, endless, ensouls, escudos, noduled, nodules, nucleon, nucleus, oddness, oldness, oneness, scolded, seclude, seconds, seduced, seduces, soddens, sounded, suddens, unclose, uncloud, uncoded, undosed, unended, unsound