The word ungratefully 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: 24
Highest Scoring Words With Friends™ Play In The Letters ungratefully
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Seven Letter Word Alert: (34 words)
alertly, allergy, engraft, fallguy, funeral, fungate, gallery, gaunter, gauntly, gauntry, gluteal, granule, greatly, gruntle, largely, lungful, neurula, neutral, rageful, refutal, regally, retally, tearful, trayful, tuneful, ululant, ululate, unalert, unalter, ungraft, unlayer, unleafy, untruly, yearful