The phrase "am proper" refers to behaving in a socially acceptable manner. Some synonyms for this phrase include being well-mannered, courteous, polite, respectful, or decorous. These words describe someone who follows the rules of society and conducts themselves in an appropriate manner. When people are "proper," they are often viewed as trustworthy, reliable, and generally pleasant to be around. However, being "proper" can also come with its drawbacks, such as being seen as too formal or rigid. Overall, using various synonyms for the phrase "am proper" can help convey different nuances to describe someone's behavior and social conduct.