Covered with crumbs; full of crumbs; also used informally to mean shabby, inferior, or unpleasant.
From 'crumb' plus the adjective suffix '-y.' Both literal (covered with crumbs) and figurative (poor quality) senses developed in English.
Crumby' is perfectly designed for alliteration with 'crummy'—both words mean bad, but 'crumby' sounds more playful while 'crummy' sounds more seriously disappointed, showing how spelling creates emotional tone.
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