The word unconvertible 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: 27
Highest Scoring Words With Friends™ Play In The Letters unconvertible
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Seven Letter Word Alert: (85 words)
binocle, blunter, bonelet, bonnier, botulin, bouncer, brucite, cloture, connive, convene, convent, convert, coterie, coulter, counter, coveter, crubeen, culvert, cutline, cutover, elector, elocute, elution, enliven, ennoble, enteric, enticer, environ, evictor, incubee, incurve, intoner, lectern, lection, lecture, lenient, leucine, leucite, neutron, nitrene, noncute, nonevil, nucleon, onliner, outlier, outline, outlive, overbit, overcut, overlie, overlit, reblent, rebuilt, recline, reclone, recount, retinol, reunion, reunite, revoice, rivulet, routine, rubicon, toluene, tribune, trilobe, trouble, trounce, trunnel, turbine, unblent, uncover, unction, unerect, unicorn, unilobe, unnerve, unrivet, uterine, veinlet, veinule, venture, vinelet, vintner, violent