The word abstrusely 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: 17
Highest Scoring Words With Friends™ Play In The Letters abstrusely
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Seven Letter Word Alert: (40 words)
ablutes, abusers, artless, barleys, basters, beastly, betrays, blaster, bluster, braless, breasts, bursate, busters, bustler, bustles, butlers, estrual, estuary, eustasy, lusters, lysates, rayless, reblast, results, rustles, saluter, salutes, slaters, slayers, stabler, stables, stayers, stylers, sublets, subtler, sutlers, sutlery, taluses, tubless, useably