The antonyms for the phrase "most well thought of" would be words that describe the opposite of being highly regarded or respected. The terms can include poorly thought of, disregarded, disreputable, nefarious, disreputable, and unsavory. These words can be used to describe someone or something that is not held in high esteem by society or is generally considered to have a lowly reputation. They can also be used to describe an idea or argument that is not well-received or is thought to be misguided. Overall, these antonyms contrast with the phrase "most well thought of" to describe things or people that are not highly regarded.