When it comes to describing someone who possesses extraordinary boldness and fearlessness, several synonyms for the word "gutsier" come to mind. One alternative term is "braver", which highlights the individual's courage and audacity in the face of adversity. Another similar word is "daring", emphasizing their willingness to take risks and step outside their comfort zone. Additionally, "fearless" captures the essence of someone undeterred by danger or apprehension. "Intrepid" also fits the bill, showcasing the person's resilience and determination. Lastly, "adventurous" evokes a sense of curiosity and eagerness for daring exploits. These synonyms all convey the notion of individuals who display exceptional gutsiness in their actions and decisions.