The word unanswerable 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: 22
Highest Scoring Words With Friends™ Play In The Letters unanswerable
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Seven Letter Word Alert: (30 words)
anneals, annuals, annular, arsenal, baleens, banaler, banners, bawneen, enabler, enables, ensnare, ensnarl, leaners, nabales, nebulae, nebular, nebulas, rebales, renewal, runnels, subarea, unaware, unbales, unlearn, unreels, unsnarl, unswear, useable, wannabe, warbles