The word startlingly 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: 18
Highest Scoring Words With Friends™ Play In The Letters startlingly
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Seven Letter Word Alert: (33 words)
allying, anglist, angrily, gastrin, gristly, install, lasting, nastily, nattily, nitryls, ratings, ratting, saintly, saltily, salting, slating, slaying, stagily, staring, starlit, stating, staying, straint, stringy, stygian, styling, syringa, tastily, tasting, transit, trysail, tyrants, yttrias