adjective, crum·bli·er, crum·bli·est.

apt to crumble; friable.

Origin of crumbly

First recorded in 1515–25; crumble + -y1
Related formscrum·bli·ness, nounun·crum·bly, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for crumbly


adjective -blier or -bliest

easily crumbled or crumbling

noun -blies

British slang an older person
Derived Formscrumbliness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012