The word profitless 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: 17
Highest Scoring Words With Friends™ Play In The Letters profitless
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Seven Letter Word Alert: (59 words)
estriol, filters, firepot, florets, florist, foister, forests, forties, fosters, lifters, lispers, loftier, loiters, lossier, ostlers, persist, petrols, pilfers, pistols, pitless, politer, posters, postils, presift, priests, profess, profile, profits, reflips, relists, repilot, replots, reposts, resifts, resoils, resplit, respots, ropiest, rosiest, sifters, slopers, softies, sorties, spoiler, spriest, sprites, sterols, stifler, stifles, stories, strifes, stripes, tipless, toilers, topless, trefoil, trifles, triples, tripole