The word unfaithfulness 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: 27
Highest Scoring Words With Friends™ Plays In The Letters unfaithfulness
:
Seven Letter Word Alert: (98 words)
affines, annulet, annulus, ashiest, aulists, aunties, elastin, eluants, enfants, enlists, entails, falsest, fanfish, fastens, fateful, fatness, faunish, faunist, fiestas, finales, finless, fishnet, fistful, fistula, fistule, fitness, flashes, flaunts, fluents, flushes, funfest, funnels, funnest, funnies, fustian, halites, hastens, hateful, hatfuls, hatless, hisself, hustles, infants, infests, inflate, infuses, inhales, insults, inulase, linnets, listens, lunates, luniest, lushest, nailset, salient, salines, salutes, seitans, selfish, sensual, sestina, shuffle, shutins, siennas, silanes, silents, sinuate, sleuths, snaffle, sniffle, snuffes, snuffle, stiffen, stifles, suffuse, sulfate, sulfite, sultans, sunfish, sunhats, sunnies, suntans, sustain, taffies, taluses, tinfuls, tinsels, tuneful, tunnels, unfaith, unleash, unlists, unseals, unseats, unstain, unstuff, utensil