The phrase "kisses ass" is often seen as inappropriate and disrespectful. As a result, there are several synonyms for this phrase that are more polite and respectful. One such synonym might be "brown-noser," which suggests a person is flattering someone else in order to gain favor or advantage. Another synonym could be "suck-up," which implies someone is trying to ingratiate themselves with another person in order to benefit in some way. Additionally, one might refer to someone as a "toady," suggesting they are overly subservient or eager to please. Ultimately, these synonyms all imply the same behavior, but offer more socially acceptable ways to describe it.