adjective
a person who is excessively proper or modest in behavior, often to the point of being overly strict or prudish
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She was often described as prudish due to her conservative views on social issues.
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Don't be so prudish, it's just a harmless joke.
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Stop being such a prude and loosen up a bit.
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His prudish attitude towards trying new things was holding him back from experiencing life to the fullest.