Underrate is a word that means to underestimate or diminish the value or importance of something or someone. Antonyms for underrate include overestimate or overvalue, which means to place too much importance or value on something or someone. Other antonyms for underrate include appreciate, value, and respect, all of which describe a positive attitude towards something or someone. These words imply a deep understanding of, admiration for, and gratitude towards something or someone. While underrate tends to carry a negative connotation, its antonyms have a positive connotation, highlighting the importance of acknowledging and appreciating the worth and value of what or who one encounters in life.