The word unjustifiable 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: 32
Highest Scoring Words With Friends™ Play In The Letters unjustifiable
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Seven Letter Word Alert: (59 words)
abluent, ablutes, albites, alibies, astilbe, aunties, baneful, belfast, bluefin, butanes, elastin, eluants, entails, fanbelt, fanjets, faunist, fibulae, filiate, finales, finials, fistula, fistule, flaunts, fluents, fusible, fustian, inflate, inulase, jestful, jibsail, lesbian, libates, lunates, luniest, nailset, nebulas, salient, sinuate, subunit, sulfate, sulfite, sunbelt, tailfin, tinfuls, tubeful, tubfuls, tubules, tubulin, tunable, tuneful, unbaits, unbales, unbelts, unblest, unbuilt, unifies, unities, utensil, utilise