in a way that involves thinking about something or someone, or doing something, too much or all the time

I was exercising obsessively but I was hardly eating and my body just couldn't cope. 我过分执着于锻炼身体，几乎不吃东西，我的身体就受不了了。

I turned into supermum, obsessively involved in every last detail of my young son's life. 我变成了超级妈妈，过分痴迷于我年幼的儿子生活的每一个细节。