The term "high-bred" refers to something or someone that is refined, of high quality or an aristocratic lineage. Its antonyms, on the other hand, include "lowborn," which signifies a person from humble origins or of lower social status. Another antonym is "uncivilized," which suggests a lack of refinement or sophistication. Additionally, the term "vulgar" may also be used to convey the opposite of high-bred, signifying a coarser or less cultured quality. Other words that can be used as antonyms for high-bred include "unrefined," "common," "plebeian," and "untutored," among others, depending on the context in which the term is being used.