Low down refers to something that is dishonest, shameful, or of poor quality. Its antonyms are terms that describe the very opposite of these negative qualities. Honesty, decency, and excellence are among the antonyms for low down. Respectability, trustworthiness, and high quality are also opposite of low down. The antonyms for low down can be used to describe things that are ethical, virtuous, or worthwhile. Synonyms for the antonyms of low down include respectable, upright, and high-quality. Overall, when looking for antonyms of low down, one should seek out terms that denote positive qualities and characteristics.