The word imperturbable 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: 27
Highest Scoring Words With Friends™ Play In The Letters imperturbable
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Seven Letter Word Alert: (88 words)
alerter, amputee, arbiter, balmier, barbule, barmier, beamlet, beebalm, beermat, bimetal, bleater, blurter, bramble, brumate, bumbler, bumpier, burbler, burlier, earlier, emirate, emptier, emulate, epaulet, epurate, erratum, impaler, impurer, lempira, lumpier, maltier, marbler, marlite, maturer, mealier, meatier, meatpie, miterer, muriate, mutable, palmier, peatier, perlite, permute, perturb, pleurae, plumber, plumier, prelate, premelt, premier, preterm, primate, primula, puerile, rambler, rapture, rarebit, realter, rebater, reblame, rebuilt, relater, replait, replate, repleat, replier, replumb, reprime, reptile, retimer, retrial, rumbler, taperer, tearier, tempera, tempura, terbium, timbale, timbrel, trailer, tramper, trample, tremble, triable, trireme, tubbier, tumbler, uralite