The word indefatigability cannot be made in Words With Friends™. It is 16 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Play In The Letters indefatigability
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Seven Letter Word Alert: (98 words)
abating, abettal, abeyant, abiding, ability, ablated, agatine, agility, agitate, aligned, analyte, anglify, anilide, bailing, baiting, balding, bandage, bandlet, batting, battled, bayleaf, beading, beatify, beating, belting, betting, bitting, blatant, 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, fitting, flanged, flatbed, flatted, flatten, flaying, fleabag, flitted, flybane, gelatin, genital, glinted, ignited, infidel, infield, inflate, initial, intagli, labiate, leading, leafing, legband, letting, libated, lifting, ligated, lignify, lignite, nattily, niftily, tabinet, tabling, tagline, tailfan, tailfin, tailing, tainted, tangled, tenably, tidying, tilting, tingled, yealing