0 in a way that involves thinking about something or someone, or doing something, too much or all the time: --
They exercise for hours, devise rigid rituals surrounding food, obsessively monitor their weight and yearn to resemble the taut-bodied celebrities whose images grace magazine covers.
Though the pop world obsessively focuses on fickle teens, consumers over 35 are the fastest-growing segment of the music-buying public in terms of per-capita spending.
Managers and publicists keep lists of fans who obsessively call or try to stalk their clients.