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"crumbly" is also used as a crossword clue. If that's what you saw, the answer is often friable (7 letters).
Definitions
easily broken into small fragments or reduced to powder
Word origin
From crumble + -y.
Used in a sentence
“Near-synonym: crumby”
“If they are right, then why aren't we seeing old crumblies like you on the cover of Vogue?”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Easily falling apart”7 letters
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