Here is a word that I KNOW I never knew what it meant.

parsimonious \par-suh-MOH-nee-uhs\, adjective:

Sparing in expenditure; frugal to excess.

His mother became increasingly parsimonious over the years, and even if there were a good doctor around she did not like to pay one.
— Willard Sterne Randall, George Washington: A Life

I also found out that in penal theory and the philosophy of punishment, parsimony (pahr’-suh-moh-nee]) refers specifically to taking care in the distribution of punishment in order to avoid excessive punishment- the theme of “sparing” is present in both definitions.

What an interesting word, and fun to say- try it. And I wonder if an opportunity will arise today to actually use it in conversation- let me know!