Unsolvable is a related term of undecipherable.
As adjectives the difference between unsolvable and undecipherable
is that unsolvable is not solvable while undecipherable is not easily deciphered; difficult to read.
unsolvable
English
Adjective
(
en adjective)
Not solvable.
Provably not solvable.
Synonyms
* insolvable
* difficult
Antonyms
* solvable
* easy