The word heartiness 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™ Play In The Letters heartiness
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Seven Letter Word Alert: (64 words)
aeriest, anthers, antsier, arenite, arsheen, arshine, arshins, ashiest, atheise, earnest, earthen, easiest, eastern, ensears, entries, ethanes, hairnet, harness, hastens, hastier, hearses, hearten, heaters, heiress, hernias, hessite, inserts, instars, nastier, nearest, neither, nesters, rashest, reheats, renests, reseats, resents, reshine, restain, retains, retinas, sateens, satires, seaters, seitans, seitens, senates, sensate, seriate, sestina, sestine, shiners, shrines, sinters, stainer, sterane, strains, tarnish, teasers, therein, trainee, trashes, triaene, trienes