Final answer:
The 7-letter word that means boldly courageous or brave is 'valiant', which is commonly used to denote heroic qualities in a person.
Step-by-step explanation:
The 7-letter word that signifies boldly courageous or brave, especially in the context of a comic strip prince, is valiant. This term is commonly used to describe someone who shows courage and determination, often in the face of danger or adversity. This word is often used to describe characters who demonstrate bravery, courage, and a willingness to confront danger. In comic strips, for example, we often see princes portrayed as valiant heroes who protect their kingdoms. When one is said to be valiant, they possess the qualities of a hero, much like the archetypical valiant knights depicted in medieval tales or the fearless characters in action-filled comic strips.