The word bewilderingly 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
Seven Letter Word Alert: (54 words)
bellied, belling, bendier, billing, bindery, birding, blender, blinder, blindly, brewing, brindle, bylined, byliner, deleing, dingier, dingily, drywell, dweller, dyeline, elderly, eleidin, eliding, greenly, grilled, illbred, inbreed, indwell, leering, legible, legibly, libeled, libeler, needily, rebegin, reblend, redline, reeling, reigned, relined, relying, rigidly, wedgier, weedily, weeding, weirdly, welding, welling, widener, wielder, willing, windier, windily, yelling, yielder