The word unfertilized 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: 28
Highest Scoring Words With Friends™ Play In The Letters unfertilized
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Seven Letter Word Alert: (55 words)
defiler, definer, deifier, denture, detinue, detuner, dietine, diluent, diluter, direful, ditzier, edifier, eleidin, erudite, fertile, fielder, fileted, firelit, flirted, friezed, fruited, inditer, infidel, infield, intrude, lenited, lintier, needful, niftier, nitride, redline, refiled, refined, refuted, reified, relined, retiled, retuned, reunite, tendril, tenured, treeful, trifled, trundle, unfired, unfreed, unified, unifier, unitize, untiled, untired, untried, uridine, uterine, utilize