maniaque

/manjak/
1.
adjective

overly particular or obsessive about order, cleanliness, or details

fastidious; fussy; meticulous

Ma coloc est hyper maniaque, elle passe l'aspirateur tous les jours.

My roommate is so picky/neat-freaky — she vacuums every day.

Synonyms:pointilleux, méticuleux, perfectionniste, obsessionnel
2.
nounmasculine

a person who is obsessive (about something)

(colloquial) a creep or pervert

Fais gaffe, y a un maniaque qui suit les gens dans le métro.

Watch out, there's a creep following people in the subway.

Synonyms:obsédé, pervers, dérangé
maniaque - French Definition & Examples