prim /prɪm/ BrE AmE adjective
[ Date: 1700-1800 ; Origin: Perhaps from Old French prin 'excellent, fine' , from Latin primus ; ⇨ ↑ prime 1 ]
1 . very formal and careful in the way you speak and behave, and easily shocked by anything rude:
She looked prim and nervous in her best hat and coat.
a very prim and proper young lady
2 . prim clothes are neat and formal:
a prim suit
—primly adverb