Adjective: straightlaced
- Exaggeratedly proper
"my straightlaced Aunt Anna doesn't approve of my miniskirts";
- priggish, prim, prissy, prudish, puritanical, square-toed [archaic], straitlaced, strait-laced, straight-laced, tight-laced, victorian, bluenosed [US, informal], uptight [informal]
See also: proper