The word furtiveness 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™ Play In The Letters furtiveness
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Seven Letter Word Alert: (61 words)
ensuite, ensures, entries, enviers, fervent, festers, festive, fetuses, finesse, fissure, fitness, furtive, fussier, infests, infuser, infuses, inserts, insures, inverse, inverts, invests, nesters, neuters, nutsier, refines, refuses, refutes, reissue, renests, resents, resifts, restive, retunes, reunite, revises, revuist, seitens, sestine, sievert, sifters, sinters, snifter, stivers, strifes, striven, strives, suiters, sunrise, surfeit, tenures, trienes, uniters, unreset, unrests, unrivet, uterine, venture, verists, versine, virtues, viruses