The word undeserving 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 undeserving
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Seven Letter Word Alert: (49 words)
dengues, deniers, derives, deveins, deviser, dinners, diverge, diverse, endings, endives, endures, engined, engines, ensuing, ensured, enviers, evening, genders, genuine, greisen, grieved, grieves, grinned, gunners, insured, inverse, needing, nerving, nursing, reeving, regives, reguide, reigned, rending, residue, reusing, revised, sedgier, seeding, sending, serving, sunnier, undines, unnerve, unrisen, veering, vending, versine, versing