The quality or state of being crinkly or full of wrinkles.
Formed from the adjective 'crinkly' (crinkle + -y) plus the nominalizing suffix '-ness,' which converts adjectives into abstract nouns describing their qualities.
The suffix '-ness' is one of English's most productive tools for creating nouns from adjectives—add it to almost any adjective and you get a noun describing that quality, which is why 'crinkliness' feels instantly understandable even if you've never heard it before.
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