The word simperingly 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: 23
Highest Scoring Words With Friends™ Play In The Letters simperingly
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Seven Letter Word Alert: (43 words)
gimpier, girlies, girnels, glimpse, gremlin, grimily, imperil, impinge, implies, inspire, limping, lingers, lisping, mingler, mingles, miserly, misrely, myelins, perming, pigmies, pilgrim, pilings, pingers, pingler, pingles, prelims, preying, priming, pryings, pygmies, relying, simpler, slimier, sliming, slinger, smilier, smiling, spinier, spiring, springy, syringe, yelming, yelping