Usage Note
Obséder is typically used in passive constructions: être obsédé par ('to be obsessed with'). The related noun is obsession (f) and the adjective obsessionnel. In informal speech, calling someone un obsédé can mean 'a pervert' or simply 'a fanatic' depending on context.
Examples
"Cette question l'obsède depuis des semaines."
Natural Translation
This question has been obsessing him for weeks.

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