difficult to decipher
of, relating to, or written with this system of symbols
Undecipherable handwriting or secret symbol.
Any symbol used in this system; a hieroglyph.
A writing system of ancient Egypt, Minoans, Maya and other civilizations, using pictorial symbols to represent individual sounds as a rebus
That cannot be read or is not easy to read.
Not able to be read—i.e. accessed or played—by some technical device.
Not sufficiently interesting to be worth reading.