undecipher means to decipher. Lexicurio rates it Rare gem — a strength score of 79 out of 100.
verb
- To decipher.“I am sure your Lordship is concerned in the former, and I think also in the latter; a good part whereof was written in characters, and cyphers set for the names. He that did undecypher it is a most honest man, and is very confident he hath hit it right.”