The quality or state of making a crisp, dry snapping sound when bitten or walked on; the texture that produces this sound.
From crunch (imitative of the sound) + -iness (suffix forming nouns of quality). Crunch itself is an onomatopoeia that emerged in English around the 1600s, while -iness became productive in forming abstract nouns by the Middle English period.
Crunchiness is one of the few words that mimics its own meaning—you can almost hear the sound in the syllables themselves! Onomatopoeia like this appears across languages (think German 'knacken'), showing how humans independently created similar sound-words across cultures.
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