The word unsanitariness 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: 18
Highest Scoring Words With Friends™ Plays In The Letters unsanitariness
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Seven Letter Word Alert: (76 words)
airiest, antenna, antsier, artisan, asinine, assarts, assents, asserts, assures, atresia, aunties, aurates, entrain, inertia, insaner, inserts, insists, instars, insures, interns, inturns, irisate, issuers, nannies, nastier, natures, nutsier, raisins, rennins, resists, restain, retains, retinas, russets, sassier, satires, saunter, saurian, searats, seastar, seitans, sestina, siennas, siestas, sinners, sinters, sinuate, sinuses, sissier, sisters, stainer, strains, stunner, suiters, sunnier, sunnies, sunrise, sunsets, sunstar, suntans, sustain, tanners, tannins, tinners, tinnier, tissues, trusses, tsarina, unearnt, uniters, unities, unrests, unrisen, unseats, unstain, urinate