The word intractable 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: 19
Highest Scoring Words With Friends™ Plays In The Letters intractable
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Seven Letter Word Alert: (52 words)
abettal, abreact, actable, airable, alicant, article, balance, banaler, battier, battler, bitrate, blatant, brittle, cabaret, cabinet, caliber, calibre, carbine, carinae, carinal, cattail, cattier, central, certain, citable, citrate, cittern, clatter, clitter, cranial, labiate, lactate, latrine, lattice, nattier, nictate, nitrate, ratbite, ratline, rattail, recital, reliant, retinal, tabinet, tactile, tantric, teacart, terabit, tertial, tetanic, trenail, triable