unleaded Syllabification: (un·lead·ed)Pronunciation: /ˌənˈledid/Translate unleaded | into German | into Italian | into Spanish Definition of unleaded adjective 1(especially of gasoline) without added tetraethyl lead. 2not covered, weighted, or framed with lead. 3 Printing (of type) with no space or leads added between lines. noun gasoline without added lead. unleaded in other Oxford dictionaries Definition of unleaded in the British & World English dictionary