Definition of "indecipherable"
indecipherable
adjective
comparative more indecipherable, superlative most indecipherable
Not decipherable; impossible to decode, read, understand or comprehend.
Quotations
The second and third quarters of the shield are indecipherable on the stone but clearer in two other representations of the arms, a painted wooden funeral hatchment for Mary Davie […]
2012 October 8, Daniel W. Patterson, The True Image: Gravestone Art and the Culture of Scotch Irish Settlers in the Pennsylvania and Carolina Backcountry, UNC Press Books, page 141
Quotations
The explanation some are suggesting is that the object takes on the appearance of what is behind it, or that it takes on the appearanec [sic] of what the observer thinks is behind it. In both cases, the object is still visible. It's a visible representation of what's behind it, but it is still invisible, just indecipherable from its surroundings.
2001 December 22, Michael A. Norville, “Why do so many DMs hate their players”, in rec.games.frp.dnd (Usenet)
A British university compared lads' mags with comments from convicted rapists. It found that people could not distinguish the source of the comments. That is, Zoo uses language practically indecipherable from that of sex offenders.
2015 May 20, Laura Pintur, “My campaign against Zoo Magazine: the well-being of girls should come before profits” (0:25 from the start), in Guardian Australia