UNLEADED Meaning of UNLEADED in English un ‧ lead ‧ ed /ʌnˈledəd, ʌnˈledɪd/ BrE AmE adjective unleaded petrol does not contain any ↑ lead—unleaded noun [uncountable] :Ben’s car only takes unleaded. Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012