The word unchivalrous 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 unchivalrous
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Seven Letter Word Alert: (27 words)
anchors, archons, chlorin, chorals, clarion, curials, curious, cushion, insular, nourish, oculars, oilcans, oscular, raucous, rosalic, ruinous, saviour, scholar, unchair, uncoils, uncurls, urachus, urchins, urinals, vacuous, various, varnish