The word unrepentantly 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: 23
Highest Scoring Words With Friends™ Play In The Letters unrepentantly
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Seven Letter Word Alert: (43 words)
annulet, aplenty, enteral, entrant, entreat, epaulet, epurate, eternal, lantern, neutral, nunnery, palette, pattern, peltate, penalty, pennant, pentane, pentyne, planner, planter, platter, plenary, pleurae, prattle, prelate, prelaty, pteryla, repanel, replane, replant, replate, repleat, tannery, taunter, ternate, trunnel, unalert, unalter, unearnt, uneaten, unlayer, unlearn, utterly