obsessivePronunciation: /əbˈsɛsɪv/Translate obsessive | into French | into German | into Italian | into Spanish Definition of obsessive adjective of the nature of an obsession:people dogged by obsessive jealousy affected by an obsession:she became obsessive about her school work noun a person who is affected by an obsession:he’s an obsessive, obsessed with having complete collections of thingsDerivatives obsessively adverb obsessiveness noun obsessive in other Oxford dictionaries Definition of obsessive in the US English dictionary