Most lowborn is an adjective used to describe someone of humble birth or low social position. Antonyms for this phrase could include those that denote someone of high status or noble birth, such as aristocratic, patrician, elite, or blue-blooded. Other antonyms for most lowborn may include words such as privileged, advantaged, wealthy, or influential. These words are used to describe people who have had privileges throughout their lives and may have been born into wealth or power. Overall, the antonyms for most lowborn convey a sense of high social status and importance.