"you re not serious are you" in German You're not serious, are you? Das kann doch nicht dein Ernst sein? Detailed translations for "you re not serious are you" You're not serious, are you? You're not serious, are you? Das kann doch nicht dein Ernst sein? You're not serious, are you? Source: opensubtitles.org Corpus by OPUS Request review Das kann doch nicht dein Ernst sein?