The word unprecedented 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: 24
Highest Scoring Words With Friends™ Play In The Letters unprecedented
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Seven Letter Word Alert: (40 words)
centred, creeped, cuprene, decreed, deducer, deepcut, deepend, denture, denuder, deputed, detrend, detrude, detuned, detuner, endured, entered, erected, eructed, erupted, pendent, pentene, percent, petered, precede, precent, preened, preteen, pretend, prudent, receded, reduced, reputed, retuned, tenured, terpene, trended, unended, unerect, upended, uptrend