The word inadmissible 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: 21
Highest Scoring Words With Friends™ Play In The Letters inadmissible
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Seven Letter Word Alert: (47 words)
abseils, aidless, aimless, alibies, anilide, badness, bedamns, bedlams, beldams, biassed, blissed, dailies, daisies, damsels, delimbs, denials, desmans, diamine, diimine, dimness, disable, dismals, imidine, inseams, insides, islands, lesbian, liaised, liaises, madness, maidens, manless, medians, midline, misdeal, misdial, mislaid, mislead, missaid, missile, salines, seminal, sideman, silanes, simians, similes, snailed