The word boundlessness 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: 21
Highest Scoring Words With Friends™ Plays In The Letters boundlessness
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Seven Letter Word Alert: (36 words)
bedless, blessed, blesses, blondes, bloused, blouses, boluses, bonuses, bounden, budless, bundles, debones, debuses, delouse, doubles, enbused, enbuses, endless, ennoble, ensouls, lessens, lessons, nodules, oldness, oneness, sodless, sonless, subnode, sunbeds, sunless, unbends, unbless, unboned, unbones, unlobed, useless