immoralism Syllabification: (im·mor·al·ism)Pronunciation: /iˈmôrəˌlizəm, -ˈmär-/Definition of immoralism noun a system of thought or behavior that does not accept moral principles. Derivatives immoralist noun Origin: early 20th century: suggested by German Immoralismusimmoralism in other Oxford dictionaries Definition of immoralism in the British & World English dictionary