Collins COBUILD Advanced Learner's English Dictionary - obsessive

(obsessives) 1. If someone’s behaviour is obsessive, they cannot stop doing a particular thing or behaving in a particular way. Williams is obsessive about motor racing... ADJ: oft ADJ about n • obsessively He couldn’t help worrying obsessively about what would happen... The Ministry is being obsessively secretive about the issue. ADV: ADV with v, ADV adj 2. An obsessive is someone who is obsessive about something or who behaves in an obsessive way. I am not an obsessive. Not at all. N-COUNT