The word fitfulness 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: 19
Highest Scoring Words With Friends™ Play In The Letters fitfulness
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Seven Letter Word Alert: (23 words)
enlists, finless, fistful, fistule, fitness, fluents, funfest, infests, infuses, insults, listens, luniest, silents, sniffle, snuffes, snuffle, stiffen, stifles, sulfite, tinfuls, tinsels, unlists, utensil