Which of the following describes an individual or entity lacking credibility or good reputation?

The term that describes an individual or entity lacking credibility or a good reputation is "disreputable." This word specifically denotes a person or entity that is regarded as shameful or untrustworthy, often due to past actions or behaviors that have led to a negative perception.

In contrast, terms such as "honest," "reputable," and "trustworthy" all convey positive attributes. An honest person is someone who is truthful and straightforward, while a reputable entity is one that enjoys a good reputation and is well-regarded in its field. A trustworthy individual is someone who can be relied upon to act in a fair and honest manner. Therefore, "disreputable" is the clear choice for identifying a lack of credibility and good reputation.