To be presumptuous means to assume something without clear evidence or authority. To avoid using this phrase, there are several synonyms that can be used in its place. One such word is "arrogant," which implies overconfidence or a sense of superiority. Another option is "bold," which suggests a willingness to take risks or act in a decisive manner. Additionally, the word "impudent" implies a lack of respect or disregard for social norms or authority. Finally, "self-righteous" describes a person who believes they are always right and deserving of respect or admiration. By using these alternatives, one can avoid the negative connotations associated with being presumptuous.