Usage Note
obsessionnel agrees in gender: feminine obsessionnelle, plural obsessionnels / obsessionnelles. In psychology it appears in trouble obsessionnel compulsif (TOC) — the French equivalent of OCD. In everyday speech it describes anyone with an intense, persistent fixation on something.
Examples
"Il a un comportement obsessionnel avec la propreté."
Natural Translation
He has an obsessive behaviour about cleanliness.

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