When referring to someone or something, if you don't feel that they are "regarded highly" you might choose to use one of many antonyms. For example, you could say they are "disdained," "rebuked," "condemned," "spurned," "criticized," or "reviled." Each of these words implies a negative sentiment or a lack of admiration. Conversely, you may use words such as "ignored," "overlooked," "neglected," or "underestimated" to demonstrate a lack of recognition or merit. Regardless of your choice of words, they will significantly affect the overall tone of your communication.