Antonyms for the phrase "intruding upon" include "respectful," "considerate," "polite," "unobtrusive," "unassuming," "invited," "welcomed," "expected," "proper," "courteous," and "appropriate." These words convey the opposite meaning of "intruding upon," which often implies an unwanted or unwarranted intrusion. By contrast, these antonyms suggest a sense of respect, politeness, and consideration for others' space and privacy. They can be used to describe a person who behaves well in social situations, avoids offending others, and respects boundaries. In all situations, it is important to use words that reflect kindness, respect, and consideration for others.