If something is rumpled, it is messy or not smooth, like when you sleep in your clothes and they get all wrinkled.
Rumpled things are not neat or tidy. They look a little messy or untidy.
Examples:
Her rumpled hair showed she had just woken up.
The rumpled paper was hard to read.
He rumpled his shirt by accident.
The cat looked funny with its rumpled fur.
After playing outside, his clothes were so rumpled.
The rumpled bed looked very comfortable.