The word inexhaustible 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 inexhaustible
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Seven Letter Word Alert: (74 words)
abluent, ablutes, absinth, albites, alibies, astilbe, atheise, auletes, aunties, axinite, baleens, banshee, bauxite, beanies, beneath, benthal, blueish, butanes, butenes, elastin, elixate, eluants, eluates, eluents, enables, ensuite, entails, enthuse, ethanes, exabits, exhales, exhaust, exhibit, exilian, halibut, halites, hasbeen, helixes, hexanes, inhabit, inhales, inulase, lateens, leanest, lenites, lesbian, libates, lineate, lunates, luniest, luxates, nailset, nebulae, nebulas, salient, sextain, sextile, sinuate, sixteen, sunbath, sunbelt, tenable, tensile, tubaxes, tunable, unbaits, unbales, unbelts, unblest, unities, unleash, useable, utensil, utilise