Which word describes someone who is bold and shameless?

The term that best describes someone who is bold and shameless is "brazen." This word conveys a sense of audacity and a lack of hesitation or shame in one’s actions, often suggesting that the individual acts boldly without regard for social norms or potential consequences.

In contrast, other choices depict characteristics that are the opposite of boldness. For instance, "timid" implies a lack of courage or assertiveness, indicating someone who is hesitant or afraid to take risks. "Reserved" refers to a person who is restrained in their behavior, often keeping their thoughts or feelings to themselves, rather than being openly bold. "Humble" denotes a lack of arrogance or pride, suggesting a modest demeanor, which again contrasts with the idea of being shameless or brazen.