Which term reflects the notion of not being genuine or being sham?

The term that best reflects the notion of not being genuine or being a sham is "pseudo." This term is often used as a prefix to indicate something that is false or not authentic, suggesting an imitation that lacks the qualities of the genuine article. For instance, when something is described as "pseudoscience," it implies that it resembles science but does not adhere to the methods or principles that define legitimate scientific inquiry.

"Pseudonym" refers specifically to a fictitious name used by an author or someone in the creative field, and it does not carry the broader implication of inauthenticity. "Pseudoscience" is a more specialized term that specifically addresses disciplines or practices that claim to be scientific but lack valid methodology. "Prototype" refers to an original model or first form of something from which other forms are derived, having a clearly defined and genuine context. Therefore, the term "pseudo" encapsulates the essence of something being not genuine or sham, making it the most appropriate choice.