Antonyms for the phrase "rated highly" include words such as "criticized," "condemned," "censured," "rebuked," and "punned." These words indicate negative opinions or judgments towards someone or something. Other antonyms could be "undervalued," "neglected," "disrespected," or "ignored," which suggest a lack of appreciation or recognition towards someone or something. "Rated poorly" could also be an antonym, indicating a low or unfavorable rating. It is important to recognize antonyms for commonly used phrases or words to enrich one's vocabulary and prevent misunderstandings in communication.