unbuild Syllabification: (un·build)Pronunciation: /ˌənˈbild/Definition of unbuild verb (past and past participle unbuilt) [with object] demolish or destroy (something, especially a building or system). (as adjective unbuilt) (of buildings or land) not yet built or built on:a slope of unbuilt landunbuild in other Oxford dictionaries Definition of unbuild in the British & World English dictionary