If I want to describe a paper has been squeezed with other books that it has a lot of lines and is not flat anymore.
1. Shall I say The paper is wrinkled?
2. Are there other common sayings to describe it has a lot of lines and is not flat anymore?
3. Are there other commom sayings to describe not flat ?
ju
The paper is crumpled.
See picture here.
If there is one line, it's called a crease; e.g., my paper is creased; there's a crease in my paper; there are several creases in my paper; my paper has a lot of creases; colloquial: the paper is (all) creased-up.
Crease | Define Crease at Dictionary.com