Synonyms: indecipherable
Definition: impossible to determine the meaning of
Usage: an indecipherable message
Similar words: incomprehensible, uncomprehensible
Definition: difficult to understand
Usage: the most incomprehensible thing about the universe is that it is comprehensible- A. Einstein
Synonyms: indecipherable, unreadable, unclear, undecipherable
Definition: not easily deciphered
Usage: indecipherable handwriting
Similar words: illegible
Definition: (of handwriting, print, etc.) not legible
Usage: illegible handwriting