The word impulsiveness 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: 26
Highest Scoring Words With Friends™ Play In The Letters impulsiveness
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Seven Letter Word Alert: (41 words)
elusive, emulsin, evulses, implies, impulse, lessens, lineups, lupines, minuses, mispens, missile, misuses, mueslis, muslins, mussels, nemesis, penises, pensive, pieless, pinless, plusses, punless, pussies, sessile, siemens, similes, simples, sinless, sinuses, snivels, spinels, spinule, spleens, splines, sunless, unveils, useless, veinule, venules, vessels, vulpine