The word inconclusively 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: 31
Highest Scoring Words With Friends™ Play In The Letters inconclusively
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Seven Letter Word Alert: (53 words)
celcius, civilly, clinics, closely, colicin, collies, collins, concise, connive, conveys, council, counsel, covines, cuisine, cyclins, cyclise, cyclone, elision, elusion, envious, eosinic, icicles, incline, inlines, inosine, insulin, inulins, invoice, lionise, locules, lousily, noisily, nonevil, novices, nucleic, nucleon, occluse, olivine, ovicell, ovinely, silicle, silicon, sunlily, sunnily, sylvine, uncivil, unclose, uncoils, unveils, venison, vicious, violins, volleys