Entry 3 senses Webster, 1913 Crummy /(krŭm"my̆)/ · Crum·my · IPA /ˈkɹʌmi/ 01 a. Full of crumb or crumbs. 1. Full of crumb or crumbs. 2. Soft, as the crumb of bread is; not crusty. 3. of very poor quality.[informal] Syn. bum, cheap, cheesy, chintzy, crummy, punk, sleazy, tinny.