obsession
//əbˈsɛʃən//
Noun
obsessionSingular
obsessionsPlural
1
A persistent, disturbing preoccupation with an often unreasonable idea, feeling, or desire that dominates one's thoughts.
His obsession with perfection made it difficult for him to finish any project.
2
The state of being obsessed with someone or something.
His obsession with perfection made it difficult for him to finish any project.
3
An activity, person, or thing that someone is excessively interested in or worried about.
Collecting vintage records has become his latest obsession.