The word "illbred" is often used to describe someone who lacks manners or social graces. However, there are several antonyms that could be used to describe someone who is well-mannered or refined. These antonyms include cultured, genteel, polished, sophisticated, and refined. A cultured individual possesses knowledge of the arts and has a sense of refinement. Genteel implies adherence to polite social conventions and manners. Polished suggests an ability to present oneself in a poised and sophisticated manner. Sophisticated conveys a level of knowledge and worldly experience, while refined suggests a well-developed sense of taste and aesthetics. Overall, these antonyms convey a sense of civility and polish that is the opposite of being illbred.