I. ob ‧ ses ‧ sive 1 /əbˈsesɪv/ BrE AmE adjective
thinking or worrying about something all the time, so that you do not think about other things enough – used to show disapproval:
an obsessive concern with cleanliness and order
obsessive about (doing) something
I try to stay fit, but I’m not obsessive about it.
—obsessively adverb
II. obsessive 2 BrE AmE noun [countable] British English technical
someone whose behaviour is obsessive