The word unwaveringly 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™ Play In The Letters unwaveringly
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Seven Letter Word Alert: (46 words)
aligner, angrily, earning, envying, granule, gravely, guanine, gunnery, inanely, inlayer, leaning, learing, leaving, levying, naively, nearing, nerving, realign, reaving, relying, ringway, unagile, unalign, unangry, unlayer, unlearn, unravel, unweary, vaguely, valuing, varying, vearing, vinegar, wangler, warning, wauling, weaning, wearily, wearing, weaving, wrangle, yarning, yawling, yawning, yealing, yeaning