The word unimpeachably 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™ Plays In The Letters unimpeachably
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Seven Letter Word Alert: (50 words)
albumen, albumin, alchemy, alumina, alumnae, amiable, amiably, anaemic, animacy, balance, biplane, bluecap, calumny, cambial, campily, canulae, capable, capably, cauline, chapman, cheaply, chimney, claypan, cleanup, humanly, hyaline, impanel, impeach, inplace, lacunae, laminae, machine, manacle, mycelia, nymphal, nymphic, paceman, paenula, panicle, paunchy, payable, pelican, pemican, plebian, pliancy, plumbic, pyaemia, pyaemic, unbalmy, unclamp