déseuropéaniser

An extremely rare, specialist neologism from political science and history writing, meaning to strip something of European character or influence — the mirror of européaniser. You will not encounter this outside academic or journalistic commentary on the EU.

• Certains analystes parlent d'une volonté de déseuropéaniser la politique étrangère du pays. — Some analysts speak of a wish to de-Europeanize the country's foreign policy.
• Ce parti souhaite déseuropéaniser le droit national. — This party wants to de-Europeanize national law.
• Il est difficile de déseuropéaniser une économie aussi intégrée. — It is hard to de-Europeanize such an integrated economy.

This is not a word most native speakers use or would recognize instantly — it belongs to specialist political commentary, so there's no everyday "common mistake" to flag beyond simply overusing a word this rare in ordinary conversation.

Often confused with européaniser.