- not readable; undecipherable; scribbled: His scrawl was almost unreadable.
- not interesting to read; dull; tedious; an unreadable treatise.
- extraordinarily difficult to read or comprehend; obscure; incomprehensible: an unreadable dream; an unreadable expression.
- illegible; undecipherable
- difficult or tedious to read
adj.c.1810, of written material, “dull, distasteful,” from un- (1) “not” + readable. Meaning “illegible” is from 1830.