The word mysteriously 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: 21
Highest Scoring Words With Friends™ Play In The Letters mysteriously
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Seven Letter Word Alert: (88 words)
elusory, elutors, emulsor, estriol, estrous, estrums, isomers, loiters, lossier, lotuses, lousier, lusters, lustier, lyrists, messily, miserly, misrely, misrule, missort, misters, misuser, mitoses, moister, moistly, molests, morsels, mortise, mossery, mossier, motleys, motlier, mousers, mousier, mousily, mueslis, musters, mustier, mustily, myrtles, mystery, oestrus, ostlers, ousters, outlier, outlies, oysters, relists, resoils, results, rimless, rosiest, rumless, rustily, rustles, rutiles, serious, smilers, smileys, smiters, solutes, somites, sorties, sourest, sterols, stomies, storeys, stories, stourie, stylers, stylier, stylise, stymies, suiters, suitors, surmise, sutlers, sutlery, systole, tissuey, toilers, toruses, tourism, tousles, toyless, trisomy, turmoil, tyloses, tylosis