Which word best describes something that is commonplace?

The word "mundane" is an excellent choice for describing something that is commonplace because it directly refers to the ordinary, everyday aspects of life. When something is termed mundane, it implies that it is not special or remarkable, aligning well with the notion of being common or usual. In various contexts, this term captures the essence of things that are encountered frequently and are thus considered standard or typical.

In contrast, "meager" suggests a lack of quantity or richness rather than commonality. "Wily," which implies shrewdness or craftiness, connotes cleverness rather than commonness. "Private" indicates something that is personal or not meant for public knowledge, which has no relation to the idea of being commonplace or ordinary. Hence, "mundane" stands out as the most fitting term to encapsulate the idea of something being commonplace.