/ ʌnˈriːdəbl; NAmE / adjective
1.
( of a book, etc. ) too dull or difficult to be worth reading
2.
= illegible
3.
if sb's face or expression is unreadable , you cannot tell what they are thinking or feeling
3.
( computing ) ( of a computer file, disk, etc. ) containing information that a computer is not able to read