obsessive

adj. /əbˈsesɪv/ B2

过分着迷的；强迫性的

Thinking too much about one particular thing in an unhealthy or abnormal way.

仙境例句

The Pigeon's obsessive watch for serpents had kept her awake for three weeks.

鸽子没完没了地提防着蛇，已经三个星期没合眼了。