The word neglectfulness 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 neglectfulness
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Seven Letter Word Alert: (30 words)
eluents, engulfs, essence, eustele, fellest, fennels, fescues, fetuses, fleeces, flenses, fluents, flugels, fullest, funnels, funnest, geneses, gentles, genuses, gleeful, glutens, gullets, gunless, gutless, legless, neglect, nestles, netless, selects, tugless, tunnels