The word terribleness 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™ Plays In The Letters terribleness
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Seven Letter Word Alert: (60 words)
beeline, beetles, berries, blesser, blister, bristle, eeriest, enlists, enterer, entrees, entries, inerter, inserts, leerier, lenites, listens, nesters, nestles, netless, rebites, reblent, rebless, reelers, reenter, reinter, relents, reliers, relines, relists, renests, renters, rerents, rerinse, resents, resters, restirs, retiles, retiree, retires, retrees, retries, ribless, riblets, rinsers, seitens, serener, sestine, silents, sinters, sneerer, steelie, steerer, sterile, sterner, teenier, tensile, tieless, tinsels, trebles, trienes