The quality or state of being crumbly; the degree to which something tends to break into small pieces.
From 'crumbly' plus the abstract noun suffix '-ness' (state or quality). Standard formation for creating nouns from adjectives.
Crumbliness is actually measured and controlled in food science—engineers adjust moisture, fat, and flour ratios to hit the exact crumbliness target for different products, turning a casual word into a precision specification.
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