The word leisureliness 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 leisureliness
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Seven Letter Word Alert: (21 words)
ensures, illness, insures, issuers, leisure, lessees, lessens, reissue, relines, resells, sellers, sessile, sillier, sinless, sinuses, sissier, sullies, sunless, sunrise, unreels, useless