1. graded adjective & adjective If you use unreadable to describe a book or other piece of writing, you are criticizing it because it is very boring, complicated, or difficult to understand. [disapproval] ⇒ For some this is the greatest novel in the world. For others it is unreadable. ⇒ Most computer ads used to be loaded with technical specifications, virtually unreadable to the average consumer. 2. adjective [usu v-link ADJ] If a piece of writing is unreadable, it is impossible to read because the letters are unclear, especially because it has been damaged in some way. ⇒ ...if contracts are unreadable because of the microscopic print. ⇒ I always cover my licence with sticky-backed plastic, but even then it can turn mouldy and unreadable. 3. graded adjective & adjective If someone's face or expression is unreadable, it is impossible to tell what they are thinking or feeling. [literary] ⇒ He looked back at the woman for approval, but her face was unreadable.
COBUILD Advanced English Dictionary. Copyright © Harper Collins Publishers