The word tactfulness 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: 20
Highest Scoring Words With Friends™ Play In The Letters tactfulness
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Seven Letter Word Alert: (45 words)
acutest, ascents, attunes, cantles, caseful, castles, clauses, cutleaf, cutlets, eluants, falsest, fastens, fastest, fatness, fattens, faucets, flatten, flaunts, fluents, lancets, latents, lunates, nutcase, nutlets, salutes, sanctus, scuttle, secants, selfact, sensual, setfast, stalest, stances, statues, sulcate, sulfate, sultans, tactful, talents, taluses, tautens, tetanus, unlaces, unseals, unseats