If you describe someone as strait-laced, you disapprove of them because they have very strict views about what kind of behaviour is moral or acceptable.
例句
He was criticised for being boring, strait-laced and narrow-minded...他被指无趣乏味，古板守旧，心胸狭窄。Our unconventional behaviour did in fact shock some of our more straitlaced friends.我们这一不合常规的行为实际上着实让我们的一些一本正经的朋友吓了一大跳。
英英词典释义
Adjective
1. exaggeratedly proper;
"my straitlaced Aunt Anna doesn't approve of my miniskirts"