大是大非 dàshìdàfēi major issues of principle Origin Definitions Defs Strokes Stroke Words Sentences Sents 1 sentence 他在大是大非面前显得非常暗，甚至不分好坏。 tā zài dàshìdàfēi miànqián xiǎnde fēicháng àn, shènzhì bù fēn hǎohuài. He seemed very muddled regarding major issues of right and wrong, even failing to distinguish between good and bad. Source: Dong Chinese Dictionary