Antonyms for the phrase "doeth right by" which means to do right or treat someone fairly are numerous. Some of the antonyms for this phrase include neglect, mistreat, abuse, cheat, exploit, deceive, trick, cheat, deceive, swindle, victimize, bully, harm, hurt, injure, sabotage, and betray. Treating someone unfairly or doing wrong by them can have a negative impact on their lives and relationships. It is important to practice empathy and kindness towards others and choose to do the right thing by them. By doing so, we can create a positive environment and inspire others to follow suit.