The quality of being characterized by or occurring in a crunching manner; the state of producing crunching sounds.
From crunching + -ness (suffix forming abstract nouns). This is a double-suffixed derivation, stacking -ing and -ness to create an abstract noun from a verb, a highly productive pattern in English.
This word is delightfully redundant with 'crunchiness'—English allows us to pile on suffixes, creating synonyms that feel subtly different even though they mean almost the same thing!
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