The word artlessness 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: 13
Highest Scoring Words With Friends™ Plays In The Letters artlessness
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Seven Letter Word Alert: (46 words)
antlers, artless, assents, asserts, earless, earnest, eastern, elaters, enseals, ensears, enteral, eternal, lateens, leaners, leanest, leasers, lessens, nearest, nesters, nestles, netless, realest, relates, relents, renests, rentals, resales, reseals, reseats, resents, reslant, saltern, sateens, sealers, seaters, senates, sensate, slaters, stealer, sterane, sternal, tassels, tealess, teasels, teasers, tresses