The term "undervaluer" typically refers to someone who places a lower value on something than what is considered appropriate or expected. Synonyms for the word "undervaluer" could include "underestimator," "discount maker," "low baller," or "underpricer." Other possible synonyms might include "belittler," "disparager," "minimizer," or "denigrator." These terms all convey a sense of someone who does not properly appreciate the value or worth of something, whether it be a product, service, or idea. Depending on the context, the most appropriate synonym for "undervaluer" may vary, but the underlying meaning remains the same.