The word inexhaustibly 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: 30
Highest Scoring Words With Friends™ Play In The Letters inexhaustibly
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Seven Letter Word Alert: (65 words)
ability, abluent, ablutes, absinth, albites, alibies, anxiety, astilbe, aunties, axinite, bauxite, beastly, benthal, blueish, bushily, butanes, butynes, bylines, elastin, eluants, entails, exabits, exhaust, exhibit, exilian, halibut, halites, hastily, hauynes, hyaline, hyalite, inhabit, inhales, instyle, inulase, lesbian, libates, lunates, luniest, luxates, nailset, nastily, nebulas, saintly, salient, sextain, shinily, sinuate, sixthly, sunbath, sunbelt, tenably, tubaxes, tunable, tunably, unbaits, unbales, unbelts, unblest, unities, unleash, unsilty, useably, utensil, utilise