The word unresistant 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: 14
Highest Scoring Words With Friends™ Plays In The Letters unresistant
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Seven Letter Word Alert: (83 words)
antsier, artiest, artists, astuter, attires, attunes, aunties, autists, entrain, entrant, entrust, insaner, inserts, instant, instars, instate, insures, intents, interns, intrust, inturns, iratest, nastier, natters, nattier, natures, nitrate, nutsier, nutters, nuttier, restain, retains, retinas, retints, satires, saunter, seitans, sestina, siennas, sinners, sinters, sinuate, sitters, situate, stainer, staters, statins, statues, stature, strains, straint, straits, stratus, striate, stunner, stunter, suiters, sunnier, sunnies, sunrise, sunstar, suntans, sustain, tanners, tannest, tasters, tastier, taunter, tautens, tenants, tetanus, tinners, tinters, transit, truants, tsarist, unearnt, uniters, unrests, unrisen, unseats, unstain, urinate