obsessive
adjective /əbˈsesɪv/
  /əbˈsesɪv/
- thinking too much about one particular person or thing, in a way that is not normal
- He's becoming more and more obsessive about punctuality.
 - an obsessive attention to detail
 
Extra ExamplesTopics Personal qualitiesc1- She continued on with an almost obsessive determination.
 - An obsessive fan was making the singer's life a misery.
 - Some collectors become obsessive.
 - The play is about obsessive jealousy.
 
Oxford Collocations DictionaryObsessive is used with these nouns:- desire
 - fan
 - jealousy
 - …