Most sisterly is a term used to describe a person or behavior that is friendly, supportive, and caring, just like a sister. However, if we were to look for antonyms for this term, we would find words that describe the opposite of sisterly behavior. These words include hateful, unfriendly, unhelpful, spiteful, and antagonistic, indicating a lack of trust, support or understanding. People who display such behaviors are often self-centered and show a lack of empathy or consideration for others, making it difficult to build lasting relationships or connections. Therefore, it is essential to avoid such behaviors and cultivate a sisterly attitude to create a peaceful and supportive environment.