The word artfulness 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: 16
Highest Scoring Words With Friends™ Play In The Letters artfulness
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Seven Letter Word Alert: (45 words)
antlers, artless, earfuls, eluants, estrual, falsest, falters, fastens, fatness, flaunts, fluents, fluster, fluters, funeral, furanes, furless, lunates, lusters, natures, neutral, refusal, refutal, rentals, reslant, restful, results, rustles, saltern, saluter, salutes, saunter, sensual, slaters, sternal, sulfate, sultans, sunstar, sutlers, taluses, tearful, unalert, unalter, unrests, unseals, unseats