The word stridently 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: 15
Highest Scoring Words With Friends™ Play In The Letters stridently
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Seven Letter Word Alert: (30 words)
delints, density, dentils, dentist, destiny, distyle, inertly, instyle, litters, nitryls, retilts, retints, slitted, slitter, snidely, sternly, stilted, stilter, stinted, stylier, tendril, testily, tilters, tinders, tindery, tinters, tiredly, trident, triynes, trysted