The word facetiously 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: 21
Highest Scoring Words With Friends™ Play In The Letters facetiously
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Seven Letter Word Alert: (45 words)
acetify, acetyls, acolyte, acutely, alecost, aloetic, autoecy, caseful, castile, celosia, coalify, coalise, coalite, cotylae, cotyles, cutleaf, elastic, eustacy, faculty, falsity, faucets, fistula, fistule, folates, foliate, foulest, futiley, isolate, laciest, lactose, layouts, locates, lucites, oculist, outface, outlays, outlies, outsail, saucily, selfact, society, stoical, sulcate, sulfate, sulfite