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
Opaque; obscure; not translucent or transparent.
Not penetrable.
Incomprehensible; fathomless; inscrutable.
A person not openly given to friendship.