The word pricelessness 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™ Play In The Letters pricelessness
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Seven Letter Word Alert: (51 words)
censers, cerises, cresses, crispen, eclipse, epicene, essence, iceless, lessees, lessens, license, lispers, peelers, pencils, penises, pieless, pierces, pincers, pinless, precise, presses, princes, recipes, recline, reclips, relines, repeels, repiles, repines, replies, reslice, respice, respins, screens, secerns, seepier, sessile, silence, sincere, sinless, sleeper, slicers, snipers, species, spicers, spinels, spleens, splenic, splicer, splices, splines