Great heartedness is a term used to refer to a person's generosity, kindness, and overall good nature. However, its antonyms could mean the opposite of these traits. One such antonym could be "small heartedness," which refers to a person's pettiness, lack of compassion, and selfishness. Another antonym could be "mean spiritedness," which implies cruelty, spite, and malice. Additionally, "narrow mindedness" could be an antonym for great heartedness, as it denotes a lack of open-mindedness, empathy, and willingness to embrace diversity. In short, the antonyms for great-heartedness describe traits that are undesirable and typically do not have a positive impact on others.