The word undiplomatic 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: 25
Highest Scoring Words With Friends™ Play In The Letters undiplomatic
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Seven Letter Word Alert: (43 words)
aplitic, auction, campion, campout, capitol, caption, caution, coadmit, coalpit, conduit, conidia, cotidal, diction, diploma, diptail, domatic, dulcian, implant, impound, inuloid, lamnoid, lunatic, maudlin, monilia, nomadic, nuptial, optical, optimal, outplan, pinitol, pintail, plaudit, ploidic, politic, potamic, poundal, tailpin, talonid, timpani, topical, unclamp, unclipt, utopian