noun, feminine/ɛk.stʁa.va.ɡɑ̃s/plural: extravagances
extravagance is feminine in French.
extravagance
“1837 Louis Viardot, L’Ingénieux Hidalgo Don Quichotte de la Manche, translation of El ingenioso hidalgo Don Quijote de la Mancha by Miguel de Cervantes Saavedra, Chapter I” — His curiosity and his extravagance came to the point that he sold several arpents of good working land to buy books of chivalry to read.