The word unfaltering 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: 20
Highest Scoring Words With Friends™ Play In The Letters unfaltering
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Seven Letter Word Alert: (75 words)
aligner, annulet, antigen, earning, elating, eluting, engraft, entrain, failure, fainter, fatigue, fearing, felting, figural, finagle, fireant, flaring, fluting, fragile, frigate, fueling, funeral, fungate, funnier, furling, gainful, gaunter, gelatin, genital, gentian, granite, granule, gruntle, guanine, gunfire, inflate, ingraft, ingrate, lantern, latrine, leafing, leaning, learing, nearing, neutral, rafting, rageful, ranting, ratline, realign, refutal, regnant, reliant, renting, retinal, ringlet, tagline, tailgun, tangier, tearful, tearing, tingler, trenail, trunnel, turfing, turning, unagile, unalert, unalign, unalter, unearnt, ungraft, unlearn, uralite, urinate