The word fretfulness 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 fretfulness
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Seven Letter Word Alert: (43 words)
effuses, eluents, ensures, festers, fetuses, flenser, flenses, fluents, fluster, fluters, fretful, fuelers, funfest, furless, lusters, nesters, nestles, netless, neuters, refuels, refuses, refutes, relents, renests, resents, restful, restuff, results, retunes, ruffles, rustles, snuffer, snuffes, snuffle, stuffer, suffers, sutlers, tenures, treeful, truffle, unreels, unreset, unrests