The word unresentful 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: 19
Highest Scoring Words With Friends™ Play In The Letters unresentful
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Seven Letter Word Alert: (29 words)
eluents, fennels, flenser, fluents, fluster, fluters, fuelers, funnels, funnest, futures, neuters, refuels, refutes, relents, rennets, restful, retunes, runnels, stunner, tenners, tenures, treeful, trunnel, tuneful, tunnels, unfurls, unreels, unreset, urnfuls