不惮 bùdàn not fear Origin Definitions Defs Strokes Stroke Words Sentences Sents 不惮烦 bùdànfán to spare no effort To not shrink from trouble; to take the trouble to do something.不惮其烦 bùdànqífán not to spare any pains not to mind taking the trouble to do something; to be very patient and undeterred by difficulties or complexity