The phrase "low-down dirty" refers to something or someone who is dishonest, unscrupulous, or deceitful. Antonyms for this phrase include "upright," "honest," "moral," "virtuous," "decent," and "honorable." These terms describe a person or action that is characterized by integrity, reliability, and fairness. An individual who is "upright" is known for their moral character and adherence to ethical standards. "Honest" implies truthfulness and transparency, while the term "moral" emphasizes the principles of right and wrong. "Virtuous," "decent," and "honorable" describe a person who is respected for their good behavior and conduct.