The word tiresomeness 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: 16
Highest Scoring Words With Friends™ Play In The Letters tiresomeness
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Seven Letter Word Alert: (72 words)
eeriest, emerses, emoters, enemies, entrees, entries, erotise, esteems, estrone, inserts, isomere, isomers, meeters, meioses, mentors, meronts, messier, meteors, metrise, minters, missort, misters, mitoses, moisten, moister, monster, mortise, mossier, nemesis, nesters, norites, nosiest, onetime, orients, osseins, reemits, remeets, remines, remints, remotes, renests, resents, resists, restems, retimes, rosiest, seitens, seniors, sensors, sermons, session, sestine, siemens, sinters, sisters, smiters, soirees, somites, sorties, stenose, stereos, stomies, stoners, stonier, stories, teemers, teenier, tensors, tossers, tresses, trienes, triones