Synonyms of 'prig'
She was heartily disliked by everyone as a prig and a bore.
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If you call someone a goody-goody, you mean they behave extremely well in order to please people in authority.
He's a bit of a goody-goody.
If you call someone a prude, you mean that they are too easily shocked by things relating to sex.
I'm no prude but I've never heard such filth.
Thesaurus for prig from the Collins English Thesaurus
If you call someone a prig , you disapprove of them because they behave in a very moral way and disapprove of other people's behaviour as though they are superior .