The word uncultivatable 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: 29
Highest Scoring Words With Friends™ Play In The Letters uncultivatable
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Seven Letter Word Alert: (48 words)
abettal, abluent, abuttal, aclinal, actable, actuate, albinal, alicant, alluvia, balance, blatant, bullate, cabinet, canulae, cattail, cauline, citable, clavate, cueball, cutline, eluvial, iceball, labiate, lactate, lacteal, lacunae, lattice, livable, lunatic, nautica, netball, nictate, tabinet, tableau, tactile, tactual, tetanic, tubulin, tunable, ululant, ululate, unabate, unbuilt, valance, valiant, valuate, vanilla, victual