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countable and uncountable, plural sumpsimuses
Adherence to or persistence in using a strictly correct term in rejection of a more common (but technically incorrect) form. quotations examples
I'll not change my old mumpsimus for your new sumpsimus!
c. 1575, Edward Underhill, Autobiography, John Nichols (ed.)
Some be too stiff in their old mumpsimus, others be too busy and curious in their sumpsimus.
1545, Henry VIII of England, a speech
A person obstinate or zealous about such correctness; a pedant. examples