obsessive (obsessives plural )
1 adj 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...
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obsessively adv
He couldn't help worrying obsessively about what would happen...
2 n-count An obsessive is someone who is obsessive about something or who behaves in an obsessive way.
I am not an obsessive. Not at all.