Antonyms for the phrase "regards highly" include: disregards, disparages, belittles, underestimates, disrespects, and devalues. Disregarding someone may indicate a lack of concern or interest in their well-being or achievements. When someone disparages or belittles another person, they are expressing dislike, criticism, or contempt. Underestimating someone's abilities can lead to underperformance and disappointment. Disrespecting someone shows a lack of consideration and regard for their feelings and opinions. Finally, devaluing someone indicates that they are not held in high esteem or importance.