The word unseasonably 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: 21
Highest Scoring Words With Friends™ Play In The Letters unseasonably
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Seven Letter Word Alert: (24 words)
abalone, abyssal, anaboly, analyse, anneals, annuals, baloney, blouses, boluses, bonuses, ensouls, nabales, nanobes, nebulas, nonsale, noseans, sayable, sensual, soybean, unbales, unbless, unbones, unseals, useably