The word inexactness 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: 23
Highest Scoring Words With Friends™ Play In The Letters inexactness
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Seven Letter Word Alert: (37 words)
ancient, annexes, ascents, ascites, canines, canteen, caseins, catenin, easiest, encases, entices, excises, excites, exsects, incants, incense, incests, inexact, insects, intense, nascent, neatens, sateens, seances, secants, seitans, seitens, senates, sensate, sestina, sestine, sexiest, sextain, siennas, sixteen, stances, stannic