IPA: /ˈkrɪŋkliər/
KK: /ˈkrɪŋkliər/
Having many small folds or wrinkles; more wrinkled than something else.
The crinklier paper was perfect for making origami.
Comparative: more crinkly
Superlative: most crinkly
Crinklier is formed from "crinkle" (of uncertain origin, possibly imitative of the sound of crinkling) and the suffix "-ier" (meaning more). The word describes something that has more crinkles or is more crinkled than something else.
Think of something that has more 'crinkles' — the '-ier' means more, so crinklier means having more crinkles.