(of handwriting, print, etc) legible, possible to read or at least decipher
If that sign was still readable we'd know where we are!
Which can be read—i.e. accessed or played—by a certain technical type of device
No sale, those aren't readable with my DVD-player!
(of a book) enjoyable to read, of an acceptable stylistic quality or at least functionally composed
These assembly instructions aren't readable, I still don't have a clue how to start!