Language/French/Vocabulary/longest-word

What is the longest French word?

The longest word of the French language is "anticonstitutionnellement", with 25 letters.

It means unconstitutionally, "contrary to the rules of government organization." (« de façon contraire aux règles de l'organisation des pouvoirs publics d'un gouvernement .»)

Examples of use:

• Certains chefs d'Etats agissent anticonstitutionnellement - Some heads of state act unconstitutionally.
• Cette décision du parlement a été proclamée anticonstitutionnellement - This decision of the parliament was proclaimed unconstitutionally