Unreadable (adjective)

1. Not able to be read or deciphered.
2. Not interesting or enjoyable to read.

Origin:

Early 17th century: from un- (expressing negation) + readable, from the verb read.

Examples:

1. The writing was unreadable.
2. The handwriting was unreadable.
3. The text was unreadable.
4. An unreadable novel.
5. The screen was unreadable.