strait-laced
adjective disapproving uk/ˌstreɪtˈleɪst/ us/ˈstreɪt.leɪst/
（尤指在性问题上）古板的，拘谨的，保守的
having old-fashioned and unchanging morals, especially relating to sexual matters
The joke shocked her strait-laced parents. 这个笑话让她古板的父母惊呆了。
Synonyms: priggish prim prissy puritanical