Outbalancing is a verb meaning to surpass in importance or weight, to outweigh, or to offset or counterbalance. The antonyms of outbalancing, on the other hand, refer to the opposite actions that reduce the significance or weight of something. Some antonyms include underbalancing, undervaluing, undermining, underestimating, diminishing, devaluing, and disregarding. These words describe actions that result in lowering the worth, importance, or weight of something. For instance, instead of outbalancing opinions in a debate, one may underbalance or undermine another's argument by providing discrediting evidence. In summary, the antonyms of outbalancing reflect actions or behaviors that result in the reduction of the significance of something.