The word complainingly 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: 30
Highest Scoring Words With Friends™ Plays In The Letters complainingly
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Seven Letter Word Alert: (53 words)
acyloin, alginic, alimony, allonym, allying, anionic, calling, calming, campily, camping, campion, cannily, cannoli, cloning, cloying, coaling, coiling, coining, company, copying, illogic, lancing, lanolin, limning, limping, loaning, logical, mailing, mangily, milling, million, mincing, moaning, monilia, myalgic, nailing, nomancy, nominal, nonclay, nonmail, nonplay, opining, paining, palling, palming, pillion, placing, plainly, planing, playing, pliancy, polling, ponyman