There are several synonyms for the phrase "in the blood", which is a common expression used to describe traits or behaviors that are innate or inherited. Some synonyms for this phrase include "ingrained", "instinctual", "inborn", "innate", and "natural". These words all suggest that something is deeply rooted within a person's nature or character, and is a fundamental aspect of who they are. Whether it is a talent, a tendency, or a personality trait, these synonyms capture the idea that certain qualities are deeply embedded within us, and are not easily changed or overcome.