The word unsparingly 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: 22
Highest Scoring Words With Friends™ Play In The Letters unsparingly
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Seven Letter Word Alert: (42 words)
airguns, angrily, gunplay, insular, langurs, lapsing, nursing, parings, parsing, pausing, planing, playing, plugins, praying, pruning, pryings, pulsing, purlins, pursing, rasping, rulings, sapling, slaying, snaring, spangly, sparing, spaying, splurgy, springy, sunnily, syringa, unalign, unangry, ungrasp, unpairs, unplays, unsling, unsnarl, uprisal, urinals, yarning, yauping