不苟言笑 bùgǒuyánxiào serious and reserved Definitions Defs Origin Strokes Stroke Words Sentences Sents 不苟 bùgǒu conscientious not lax; not casual; careful and serious in one's work or behavior言 yán noun speech words; talk; what is said笑 xiào verb to smile or laugh to have a happy expression on one's face or make sounds expressing joy; to smile; to laugh