adjective, crumblier, crumbliest.
apt to crumble; friable.

1515–25; crumble + -y1

crumbliness, noun
uncrumbly, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crumbly (ˈkrʌmblɪ)
adj , -blier, -bliest
1.  easily crumbled or crumbling
n , -blier, -bliest, -blies
2.  slang (Brit) an older person

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The ceramic superconductors are brittle and crumbly and therefore it's troublesome to make wires, bricks, etc out of them.
Any stone that is not overly soft and crumbly seems to have been used for a wall.
The ethyl groups replace oxygen in the silicate ion chains, creating a solid but crumbly silicone polymer.
Raspberries with the virus develop small, crumbly fruit that is unsuitable for use as whole berries.
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