The word obliviousness 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 obliviousness
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Seven Letter Word Alert: (39 words)
blisses, blouses, boluses, bonuses, bovines, elision, elusion, ensouls, envious, insoles, ionises, lesions, lessons, lioness, lionise, loonies, loosens, niobous, obvious, oleosin, olivine, osseins, osseous, session, sinless, sinuses, slovens, snivels, sonless, subsoil, subvein, sunless, unbless, unilobe, unloose, unveils, violins, visible, visions