Barth, Karl Syllabification: (Barth, Karl)Pronunciation: /bärt/Definition of Barth, Karl (1886–1968), Swiss theologian. His seminal work Epistle to the Romans (1919) established a neo-orthodox or theocentric approach to contemporary religious thought that remains influential in Protestant theology. Barth, Karl in other Oxford dictionaries Definition of Barth, Karl in the British & World English dictionary