What is another word for under-estimation?
Pronunciation: [ˌʌndəɹˌɛstɪmˈe͡ɪʃən] (IPA) 
Under-estimation is the act of underestimating something or someone and not giving them the credit they deserve. Some synonyms for the word under-estimation include belittlement, undervaluation, deprecation, trivialization, and downplaying. Belittlement refers to making someone or something seem unimportant or insignificant. Undervaluation implies that something is not properly appreciated or recognized for its full worth. Deprecation suggests that something is being criticized or discredited in an unjustified or unwarranted manner. Trivialization means making something seem less important or significant than it really is. Downplaying is to minimize the significance, importance, or impact of something or someone. Using these synonyms can help convey the idea of under-estimation with more precision and variety.
