The word "disconfirming" means to contradict or deny an existing belief. Antonyms for this word would include "confirming", "validating", "endorsing", "affirming", "proving", "endorsing" and "substantiating". These words suggest the idea of supporting, approving or validating something rather than negating it. For instance, confirming a theory means that one has found evidence to support or prove it true, while disconfirming it would mean that one has found evidence to contradict or negate it. Therefore, using antonyms such as "confirming" or "validating" would imply a positive connotation and suggest that something is being approved or substantiated rather than being negated or invalidated.