Final answer:
The word 'callowness' in the excerpt from Chapter 5 of The Call of the Wild refers to a lack of maturity and sophistication, particularly in relation to Hal's youthful inexperience and ostentatious display of a cartridge-filled belt.
Step-by-step explanation:
In the excerpt from Chapter 5 of The Call of the Wild, the term callowness is used to describe Hal, a character who is young and inexperienced. The word 'callowness' indicates a lack of maturity or sophistication, which is evident from Hal's bearing and actions. Notably, Hal's belt, which 'fairly bristled with cartridges,' is highlighted as the most prominent feature about him, suggesting that he is trying to make an impression that does not match his actual abilities or understanding of the Yukon environment he has ventured into.