The word frivolousness 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: 23
Highest Scoring Words With Friends™ Play In The Letters frivolousness
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Seven Letter Word Alert: (64 words)
elusion, ensouls, envious, erosion, finless, fissure, florins, flosses, fossils, furless, fusions, fussers, fussier, infuser, infuses, infusor, insoles, insures, issuers, lesions, lessons, lessors, lioness, loonier, loonies, loosens, lossier, lousier, louvers, louvres, nervous, noosers, olefins, oleosin, onerous, orioles, osseins, osseous, ourself, ovenful, resoils, seniors, sensors, serious, session, silvers, sinless, sinuses, slivers, slovens, snivels, solvers, sonless, sooners, sulfone, sunless, sunrise, sunroof, surveil, unloose, unveils, velours, version, viruses