The word unadvisable 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: 22
Highest Scoring Words With Friends™ Play In The Letters unadvisable
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Seven Letter Word Alert: (30 words)
abludes, abulias, abusive, aliased, anviled, audible, availed, belauds, bundles, denials, devisal, diabase, disable, divulse, dualise, inulase, invades, lesbian, nabales, nebulas, savable, snailed, subvein, sundial, unbaled, unbales, unideal, unsaved, unveils, vandals