The word ungrammatical 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™ Plays In The Letters ungrammatical
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Seven Letter Word Alert: (45 words)
alicant, almanac, alumina, amalgam, amanita, anagram, angular, arcanum, calming, canular, cariama, carinal, carting, cingula, cranial, cranium, crating, curling, curtail, curtain, guarani, laminar, lunaria, lunatic, macular, magical, mailcar, mailman, malacia, malaria, malting, marital, martial, martian, mauling, migrant, natural, nautica, ramming, ruminal, tailgun, tangram, tracing, tramman, truncal