dumbphone Syllabification: (dumb·phone)Pronunciation: /ˈdəmˌfōn/Definition of dumbphone noun a basic cell phone that lacks the advanced functionality characteristic of a smartphone:there are still six dumbphones out there for every smartphoneOrigin: 1990s: from dumb and phone1 (as opposed to smartphone)dumbphone in other Oxford dictionaries Definition of dumbphone in the British & World English dictionary