The word uncertainly 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: 20
Highest Scoring Words With Friends™ Plays In The Letters uncertainly
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Seven Letter Word Alert: (64 words)
acutely, ancient, annuity, annulet, article, auricle, cannery, cannier, cannily, catenin, cauline, cautery, centaur, central, century, certain, clarity, clayier, cruelty, curtail, curtain, cutlery, cutline, cyanine, cyanite, entrain, icetray, inanely, inertly, inlayer, irately, lantern, larceny, latency, latrine, lunatic, nectary, neutral, nuclear, ratline, raucity, reality, recital, reliant, retinal, tannery, tearily, tenancy, treacly, trenail, truancy, truncal, trunnel, unalert, unalter, unclean, unclear, uncrate, unearnt, unitary, unlayer, unlearn, uralite, urinate