Usage Note
Obsession is used in both psychiatric contexts and informal speech to describe a persistent preoccupation. The verb obséder means 'to obsess' or 'to haunt'; obsédé (noun) means 'obsessive' or colloquially 'a pervert'. The phrase avoir une obsession pour is the natural construction.
Examples
"Son obsession pour le travail l'épuise."
Natural Translation
His obsession with work exhausts him.

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