The word falteringly 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: 21
Highest Scoring Words With Friends™ Play In The Letters falteringly
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Seven Letter Word Alert: (64 words)
agilely, alertly, aligner, allergy, allying, anglify, angrily, elating, engraft, fainter, faintly, falling, fearing, felling, felting, finagle, finally, fireant, flaring, flaying, fragile, frailly, frailty, fraying, frigate, gallery, gelatin, genital, granite, gratify, greatly, inertly, inflate, ingraft, ingrate, inlayer, irately, largely, latrine, leafing, learing, literal, rafting, ratline, realign, reality, regally, reliant, relying, retally, retinal, retying, ringlet, tagline, tallier, tangier, tearily, tearing, telling, tillage, tingler, trenail, yealing, yelling