Well mannered and well turned out.
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prim means - strait-laced; prudish.
proper means - Strictly following rules or conventions, especially in social behavior; seemly.
Thus the expression 'prim and proper' is a Victorian English expression which referred to people (usually ladies) who behaved in a very formal and correct way and were easily shocked by anything rude.
The word pair for prim is proper PRIM AND PROPER
Prim and Proper,
proper
real, true, meet
She was oh so prim and proper.
Proper.
prim
prim
proper
As a small child, visiting Aunt Maude, who was so prim and proper, was not something I looked forward to.
Excessively prim and proper
prim and proper means when someone tries to show oneself to be extra-ordinarily superb,qualitative, perfectionist in matters of speech and dressing.