The word incapableness 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: 25
Highest Scoring Words With Friends™ Play In The Letters incapableness
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Seven Letter Word Alert: (69 words)
abscise, abseils, absence, alanine, aliases, alpeens, alpines, anneals, balance, baleens, beanies, biplane, canapes, canines, capable, capless, caseins, cleanse, eclipse, elapses, enables, encases, enclasp, enseals, escapes, iceless, incense, inclasp, inplace, inscape, lesbian, license, lipases, nabales, napless, palaces, palsies, panicle, pansies, pascals, pelican, penance, pencase, pencils, penises, pennies, pieless, pinenes, pinless, pleases, plebian, salines, scabies, scalene, seances, siennas, silanes, silence, spacial, spaniel, special, species, spelean, spinals, spinels, spleens, splenic, splices, splines