In-born is often referred to an innate or inherent quality that a person or thing possesses. It can be described as something that is natural or instinctive, and it is often associated with a person's character or traits. Antonyms for in-born would, therefore, refer to characteristics that are acquired or learned over time. Some possible antonyms for in-born could include acquired, learned, developed, taught, or nurtured. By contrast to in-born, these words suggest that a person's qualities or abilities are not innate, but rather result from experience, education, or upbringing.