Antonyms for the word "underestimated" include "overestimated," "overrated," "oversold," "overbelieved," and "overhyped." These words suggest that something was thought to be better or worse than it actually was. When we underestimate something or someone, we fail to realize their true potential, and we might not show enough value or appreciation towards them. Overestimating can also be problematic because it can lead to disappointment, disillusionment, and unrealistic expectations. Therefore, using accurate and balanced assessments is the key to avoid underestimation and overestimation. It helps us to recognize the value and potential of everything and everyone around us, allowing us to make better decisions and form better relationships.