The word incredulous 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: 19
Highest Scoring Words With Friends™ Play In The Letters incredulous
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Seven Letter Word Alert: (51 words)
ceroids, cinders, cloners, closure, coiners, counsel, coursed, cronies, cruised, crunode, curdles, curious, discern, elusion, include, indoles, indorse, inducer, induces, insured, lousier, nodules, nordics, nucleus, nuclide, recoils, recoins, rescind, resound, rosined, roundel, ruinous, scolder, scorned, scoured, sluiced, sluicer, soldier, sounder, sourced, unclose, uncloud, uncoils, uncords, uncored, uncured, uncurls, uncurse, undoers, unoiled, unruled