Which term refers to a person without substance or integrity?

The term "Straw Man" refers to a person or argument that lacks substance or integrity. In a broader context, a "straw man" often represents a weak or oversimplified version of an opponent's argument that is easily refuted, rather than engaging with the actual position being argued. This metaphor extends to the idea of a person lacking depth or authenticity, suggesting that their presence or arguments are not grounded in real principles or values.

The other terms do not convey this meaning. "Illustrious" refers to someone who is well-known and respected, often for achievements or qualities that have true merit. "Substantial" indicates a degree of importance or real existence, which is the opposite of lacking substance. "Virtuous" denotes someone possessing high moral standards or integrity, countering the notion of being without integrity. Therefore, "Straw Man" is the best-fitting answer, aligning with the concept of superficiality or insincerity in a person.