obsessively
adv. manner B2 Upper Intermediate US //ɑbˈsɛsɪvɫi// UK //ɒbsˈɛsɪvli// ob·ses·sive·ly
adv. doing something in a way that shows you are thinking about it too much. You use this when someone is focused on one thing to the point of being annoying or unhealthy.
adv. in a manner characterized by excessive or unhealthy preoccupation with a single subject. Often implies a lack of control or a narrowing of focus to the exclusion of other interests.
He checks his phone obsessively throughout the day.
She organized her bookshelf obsessively, arranging every volume by color and height.
The detective worked obsessively on the cold case, convinced that a single overlooked detail in the original report would eventually lead to a breakthrough.