High-mindedness refers to the quality of being noble, intellectual or virtuous. Antonyms for high-mindednesses would, therefore, refer to the opposite of these qualities. In this context, antonyms could include selfishness, dishonesty or narrow-mindedness. Selfishness denotes a lack of concern for others, and a focus on selfish interests rather than the greater good. Dishonesty refers to the quality of being dishonest or deceitful, lacking integrity and showing a willingness to deceive or cheat others. Narrow-mindedness refers to a limited, narrow perspective and an unwillingness or inability to consider other viewpoints. Therefore, the antonyms of high-mindednesses are traits that promote negativity, selfishness, and lack of empathy.