The word unremorseful 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: 22
Highest Scoring Words With Friends™ Play In The Letters unremorseful
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Seven Letter Word Alert: (28 words)
emulous, emulsor, ensurer, ferrous, flenser, foremen, formers, forseen, fuelers, fulsome, furlers, mourner, oneself, ourself, reforms, refuels, refurls, refuser, remorse, resumer, ruesome, rumours, sulfone, unforms, unfurls, unreels, urnfuls, uromere