scepticalPronunciation: /ˈskɛptɪk(ə)l/ (US skeptical)Translate sceptical | into French | into German | into Italian | into Spanish Definition of sceptical adjective 1not easily convinced; having doubts or reservations:the public were deeply sceptical about some of the proposals 2 Philosophy relating to the theory that certain knowledge is impossible. Derivatives sceptically (US skeptically) adverb sceptical in other Oxford dictionaries Definition of sceptical in the US English dictionary