The phrase "out of wedlock" has been around for centuries and refers to a child who is born to parents who are not married. However, there are many different synonyms that can be used to describe this situation. Some common alternatives include "illegitimate," "bastard," "born out of wedlock," "extra-marital," "unwed," "unacknowledged," "love child," or "non-marital." These words may have different nuances in meaning, but they all essentially convey the same idea: the child's parents are not married, which can carry social stigma or legal implications depending on the time and place. Overall, the important thing is to treat all children with respect and love, regardless of their parents' marital status.