Use "crumby|crumbier|crumbiest" in a sentence
1. Crumby means “full of crumbs.” Crummy means “lousy.” In British English, crumby and Crummy can mean the same thing
2. Preparation for De-Crumbing the Table: Use Metal crumbier for linen surfaces
3. Crummy and crumby are both valid words, but they mean different things