The definition of mysterious is something that is not understood or known.
Having hidden meaning.
Hard to read or understand
Not legible or decipherable; illegible:
Not legible or decipherable.
Indistinctly heard; faint.
Find another word for indecipherable. In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for indecipherable, like: mysterious, cryptic, hieroglyphic, unreadable, vague, illegible, obscure, scrawled, unclear, undecipherable and unintelligible.