The word shiftlessness is playable in Scrabble®, but 1 blank substituting for the letter 's' is required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Scrabble® Letter Score: 18
Highest Scoring Scrabble® Plays In The Letters shiftlessness
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Seven Letter Word Alert: (29 words)
enlists, felines, felsite, finesse, finless, fishnet, fitness, flenses, fleshes, hessite, hisself, infests, lefties, lenites, lessens, listens, nestles, netless, seitens, selfies, selfish, sessile, sestine, silents, sinless, stifles, tensile, tieless, tinsels