Longman Dictionary of Contemporary English homepage

obsessive

1 adjective
     
ob‧ses‧sive1
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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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