unfamiliarPronunciation: /ʌnfəˈmɪlɪə/Translate unfamiliar | into French | into German | into Italian | into Spanish Definition of unfamiliar adjective 1not known or recognized:he felt a stranger among the crowd of unfamiliar faces his voice was unfamiliar to her unusual or uncharacteristic:the yellow taxicab was an unfamiliar sight on these roads 2 (unfamiliar with) not having knowledge or experience of:he seems unfamiliar with recent research on this topicDerivatives unfamiliarityPronunciation: /-lɪˈarɪti/ noun unfamiliar in other Oxford dictionaries Definition of unfamiliar in the US English dictionary