The word tiresomely 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 tiresomely
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Seven Letter Word Alert: (34 words)
emoters, erotise, estriol, eyeslit, isomere, loiters, melters, meteors, metrise, miserly, misrely, moister, moistly, mortise, motleys, motlier, myrtles, omelets, reemits, remelts, remotes, resmelt, restyle, retiles, retimes, roselet, smelter, sterile, stylier, telomer, tersely, toilers, trisomy, yelmers