The word undeciphered 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 undeciphered
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Seven Letter Word Alert: (37 words)
cheeped, cheered, chirped, chunder, churned, creeped, cuprene, decider, decreed, decried, deducer, deepend, denuder, endured, epicene, epicure, eupneic, hundred, induced, inducer, needier, perched, phrenic, pierced, pinched, pincher, precede, preened, punched, puncher, receded, reduced, repined, ripened, undried, unperch, upended