The term "most low down and dirty" refers to actions or behaviors that are considered to be morally corrupt, vile, or despicable. The antonyms for this phrase would include words that signify positive or virtuous behavior like righteous, moral, ethical, principled, honorable, decent, and commendable. Actions or behaviors that embody these values would be considered the antithesis of being "low down and dirty." So, whether it's standing up for what's right, being true to your values, following the rules, or simply treating others with kindness and respect, there is always a better option than being "low down and dirty.