The word indefatigably 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: 26
Highest Scoring Words With Friends™ Play In The Letters indefatigably
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Seven Letter Word Alert: (81 words)
abating, abeyant, abiding, ability, ablated, agatine, agility, aligned, analyte, anglify, anilide, bailing, baiting, balding, bandage, bandlet, bayleaf, beading, beatify, beating, belting, bylined, datable, dealign, dealing, defiant, defying, dialing, dieting, digital, dignify, dignity, dingbat, dingily, editing, elating, eliding, failing, fainted, faintly, fanbelt, fantail, felting, fidgety, filabeg, filiate, filibeg, finagle, flanged, flatbed, flaying, fleabag, flybane, gelatin, genital, glinted, ignited, infidel, infield, inflate, intagli, labiate, leading, leafing, legband, libated, lifting, ligated, lignify, lignite, niftily, tabling, tagline, tailfan, tailfin, tailing, tangled, tenably, tidying, tingled, yealing