What does "defiantly" most nearly mean?

"Defiantly" refers to a manner of behavior that shows bold resistance or disregard for authority or opposing forces. When someone acts defiantly, they are expressing a strong will, often in a challenging or confrontational way. This aligns closely with the meaning of "obstinate," which describes someone who stubbornly refuses to change their opinion or chosen course of action, regardless of persuasion or authority.

In contrast, the other options convey meanings associated with compliance or submission. They suggest acceptance or a lack of resistance, which does not fit the meaning of "defiantly." Therefore, "obstinate" is the most appropriate choice that captures the essence of acting with defiance.