yán sù de xìng gé

having a serious character

The Chinese phrase '严肃的性格' describes someone who has a serious demeanor or personality. This term is often used to characterize individuals who are focused, responsible, and not prone to frivolity. In social or professional settings, a person with a '严肃的性格' may be seen as trustworthy and dependable, but might also be perceived as lacking in humor or warmth.