ennui UK /ɒnˈwiː/US /ɑnˈwi/noun 1verb 1forms 4 noun1 •A gripping listlessness or melancholia caused by boredom; depression.There have always been individuals who toy with the political extremes out of a sort of high-class ennui. — 2025 verb1 •To make bored or listless; to weary. formsennuied · ennuyed · ennuying · ennuis