Antonyms for the word "over-values" are "undervalues," "depreciates," "downplays," "disparages," and "underestimates." Undervaluing something means that it is not given the appropriate worth, whereas over-valuing involves exaggerating its value beyond what is reasonable. Depreciating implies that there is a decrease in the perceived value of something, while downplaying means to make something seem less important than it is. Disparaging involves criticizing or belittling something or someone, while underestimating means to underestimate the importance, quality or value of something. Using these antonyms appropriately can help in creating a balanced and accurate assessment of things, people, and situations.