obsession

En français : idée fixe, obsession

1. The quality of being obsessed; an unshakeable feeling that one topic or activity must be pursued above other interests. (uncountable) · My obsession with rugby resulted in me spending years following the sport.
2. An idea that engenders a compulsive or irrational preoccupation, or the preoccupation thereby engendered. (countable) · The downfall of the chairman is an obsession that consumes Laura's time.
3. An activity or entity that inspires a compulsive and potentially unhealthy fixation, or the fixation thereby inspired. (countable) · Editing Wikipedia started as a hobby, but it's turned into a complete obsession of mine.· His current obsession is getting that law passed.
4. Influence or control by evil spirits without possession. (uncountable)

Pluriel obsessions