Which word signifies 'bold and fearless'?

The word that signifies 'bold and fearless' is audacious. This term describes someone who is willing to take risks or face challenges without hesitation or fear. It conveys a sense of bravery and confidence in one's actions and decisions, often pushing boundaries and challenging the norm.

In contrast, the other choices reflect traits that are quite the opposite of being bold and fearless. For instance, timid describes someone who lacks courage or confidence, often feeling anxious or apprehensive in new situations. Reserved refers to a person who is slow to reveal emotions or opinions, suggesting caution rather than boldness. Submissive indicates a tendency to yield to others, lacking assertiveness and independence. Therefore, audacious is the ideal word that encapsulates the idea of being bold and fearless.