Words at Play : Top 10 Rare & Amusing Insults
Definition:
a stubborn person who insists on making an error in spite of being shown that it is wrong
About the word:
Supposedly, this insult originated with an illiterate priest who said mumpsimus rather than sumpsimus ("we have taken" in Latin) during mass. When he was corrected, the priest replied that he would not change his old mumpsimus for his critic's new sumpsimus.
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