The cashier negated the charge of the item. What does negated most closely mean?

The term "negated" in the context of the sentence indicates that the cashier canceled or made the charge of the item invalid. Therefore, "nullified" is the most appropriate synonym as it directly conveys the idea of rendering something ineffective or void. When a charge is nullified, it means that it is as though it never existed, which aligns perfectly with the action of the cashier negating the charge.

In contrast, other terms like "forgotten," "questioned," and "disputed" do not capture the essence of canceling or invalidating. "Forgotten" implies a lack of memory about the charge, while "questioned" suggests a level of doubt or inquiry regarding the charge but does not indicate cancellation. "Disputed" implies a challenge to the validity of the charge but does not necessarily mean it has been rendered void. Thus, "nullified" accurately reflects the action taken by the cashier.