The word adulterously 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: 19
Highest Scoring Words With Friends™ Plays In The Letters adulterously
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Seven Letter Word Alert: (60 words)
adultly, alertly, alloyed, alludes, allured, allures, arduous, aroused, auteurs, delator, destroy, detours, dollars, dullest, duteous, elusory, elutors, estrual, estuary, laurels, layouts, leotard, loaders, loudest, loyaler, lyrated, ordeals, outdare, outduel, outlays, outlead, outread, outsell, outyell, readout, reallot, reloads, restudy, retally, roasted, rustled, saluted, saluter, sellout, stalled, stellar, strayed, strudel, sutlery, sutural, sutured, tollers, tousled, trolled, trolley, tuesday, ululate, urostea, usually, yodlers