The word unsufferably 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: 27
Highest Scoring Words With Friends™ Play In The Letters unsufferably
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Seven Letter Word Alert: (37 words)
auburns, baffler, baffles, baneful, barleys, blarney, bluffer, buffers, bureaus, earfuls, fearful, flayers, flybane, funeral, furanes, nebular, nebulas, neurula, raffles, rebluff, rebuffs, refusal, ruffles, snaffle, snuffer, snuffle, snuffly, subrule, sulfury, unbales, unblurs, unfurls, unlayer, unleafy, urnfuls, useably, yearful