Rightminded is a term used to describe a person who thinks and acts in a just and sensible way. Antonyms of rightminded would be those who think or act in a dishonest or irrational way. Some antonyms might include unethical, deceitful, or immoral. Other antonyms might include reckless or irresponsible, suggesting a person who acts without considering the consequences or the impact their actions might have on others. Additionally, someone who is close-minded or stubborn could be considered an antonym of rightminded since they refuse to consider alternative perspectives. Ultimately, antonyms of rightminded suggest a person who lacks honesty, integrity, and empathy towards others.