1) General subject: angular, as stiff as a poker, buckram, ceremonious, chilly, demure, donnish, nice nelly, nice-nelly, niminy piminy, niminy-piminy, old maidish, pokerish, prim, prim and proper, prissy, smug, square toed, square-toed, starched, starchy, stiff, stiff as a poker, stiff as a ramrod, stiff necked, stiff-necked, whalebone, stand-offish, punctilious, stuffy
2) Colloquial: offish
3) American: priss
4) Deprecatingly: uptight
5) Jargon: up tight
6) Makarov: old-maidish, stilted
7) Phraseological unit: cat that ate the canary
Универсальный русско-английский словарь. Академик.ру. 2011.