The word shudderingly 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™ Plays In The Letters shudderingly
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Seven Letter Word Alert: (53 words)
drudges, dueling, dyeings, eddying, eluding, english, gilders, girdled, girdles, girnels, gliders, greyish, griddle, grinded, guilder, guldens, gurneys, gushier, gushily, herding, hinders, hindleg, huddles, hundred, hungers, hurdled, hurdles, hurling, hydride, indulge, insured, lingers, reddish, regilds, relying, reusing, riddles, ruddies, ruddily, rulings, rushing, shingle, shingly, shreddy, shrined, shudder, singled, slinger, snidely, snudged, synurid, syringe, undried