The word indefatigable 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: 24
Highest Scoring Words With Friends™ Play In The Letters indefatigable
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Seven Letter Word Alert: (92 words)
abating, abiding, ablated, agatine, aligned, anilide, bailing, baiting, balding, bandage, bandlet, beading, beating, beefing, beignet, belated, belting, bendlet, benefit, bleated, datable, dealate, dealign, dealing, defiant, deflate, deleing, dialing, dietine, dieting, digital, dingbat, eatable, editing, elating, elegant, eleidin, eliding, enabled, failing, fainted, fanbelt, fantail, feedbag, feedbin, feeding, feeling, feigned, felting, fenagle, filabeg, fileted, filiate, filibeg, finagle, flanged, flatbed, fleabag, fleeing, gelated, gelatin, genital, gentile, gentled, gleaned, glinted, ignited, infidel, infield, inflate, intagli, labiate, leading, leafage, leafing, legband, lenited, libated, lifting, ligated, lignite, lineage, lineate, negated, tabling, tagline, tailfan, tailfin, tailing, tangled, tenable, tingled