The word strenuously 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: 17
Highest Scoring Words With Friends™ Play In The Letters strenuously
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Seven Letter Word Alert: (36 words)
elusory, elutors, ensouls, estrous, lotuses, lusters, oestrus, ostlers, ousters, outruns, oysters, results, rustles, sensory, solutes, sourest, sternly, sterols, stoners, storeys, stylers, sutlers, sutlery, sutures, systole, tensors, tenuous, tonsure, toruses, tourney, tousles, toyless, tyloses, unrests, unsorts, untruly