The word misinformed 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: 22
Highest Scoring Words With Friends™ Plays In The Letters misinformed
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Seven Letter Word Alert: (28 words)
deforms, deiform, dimmers, diosmin, fermion, finders, friends, indorse, informs, insider, iodines, iodiser, ionised, ioniser, ironies, memoirs, minders, misdoer, misdone, misfire, misform, moderns, nimrods, noisier, refinds, reminds, rosined, serfdom