The word "outgiving" refers to being generous or giving freely. Its antonyms would, therefore, be words that denote the opposite, such as greedy, selfish, ungenerous, or miserly. These words imply a lack of inclination to give or share, or a focus on self-interest rather than the well-being of others. Other antonyms for "outgiving" might include words such as parsimonious, stingy, or tightfisted, which also connote a reluctance to part with one's resources. Overall, the antonyms for "outgiving" describe individuals who are more likely to hold onto rather than share their wealth and resources.