Something that is "artificial and inferior" can be described as:

The term "ersatz" is used to describe something that is not genuine or authentic, typically implying that it is a substitute that lacks the quality or value of the original. When something is described as "artificial and inferior," it aligns perfectly with the meaning of "ersatz," as it conveys the idea of being a poor imitation or replacement of something that is better or more genuine.

In contrast, "expunge" refers to the act of removing or erasing something completely, often in a legal or formal context, and does not convey the notion of inferiority or artificiality. "Fastidious" describes a person who is very attentive to detail and meticulous, which does not relate to being artificial or inferior. Lastly, "exactitude" means precision or accuracy, emphasizing correctness rather than any artificial or inferior quality. Hence, "ersatz" stands out as the ideal choice for describing something that is both artificial and inferior.