The word felicitously 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 felicitously
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Seven Letter Word Alert: (33 words)
cellist, closely, colitis, collies, cotyles, elicits, fillets, fillies, fistule, follies, foulest, fullest, futiley, illites, iolites, listful, locules, loftily, lousily, lucites, lustily, oculist, oiliest, outlies, outsell, outyell, sellout, silicle, society, solicit, sulfite, toilful, utilise