Definitions

1. adjective

most crinkled or wrinkled; having the most prominent or pronounced crinkles

“The crinkliest part of the old map was the one showing the borders of ancient kingdoms.”

2. adverb

in the most crinkled or wrinkled manner; with the most pronounced crinkles

“The fabric crinkled most crinkliest when ironed, making it look like it was freshly wrinkled.”