The word meaninglessness 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: 24
Highest Scoring Words With Friends™ Play In The Letters meaninglessness
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Seven Letter Word Alert: (66 words)
ageless, aimless, assigns, elegies, elegise, enamels, enamine, enemies, engines, enigmas, enseals, ensigns, gasless, geminal, gemless, geneses, genesis, genials, glasses, gmelina, inseams, lassies, leaning, leasing, lensing, lessees, lessens, ligases, lineage, lineman, linemen, maligns, mangles, manless, manning, massing, meanies, meaning, measles, melange, melanin, menages, message, messing, mileage, mingles, missals, nannies, nemesis, salines, sassing, sealing, seaming, seeming, seminal, sensing, sesames, sessile, siamese, siemens, siennas, signals, signees, silanes, singles, sinless