The word unmitigable 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: 22
Highest Scoring Words With Friends™ Play In The Letters unmitigable
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Seven Letter Word Alert: (50 words)
abluent, ailment, albumen, albumin, aliment, ambient, ambling, augment, bailing, baiting, beaming, beating, belting, bimetal, bitumen, blaming, blueing, bulimia, elating, eluting, emulant, gelatin, geminal, genital, gmelina, imagine, intagli, lambing, legumin, lignite, mailing, malting, mauling, megabit, melting, miniate, mintage, mutable, mutagen, netmail, nutmeal, tabling, tabuing, tagline, tailgun, tailing, teaming, timbale, tunable, unagile