* "In-" is a prefix meaning "not" or "the opposite of".
* "Fidelis" means "faithful".
Therefore, "infidel" literally means "not faithful" or "unfaithful".
Historically, the term "infidel" referred to someone who did not believe in Christianity. Over time, it has evolved to encompass anyone who does not adhere to a particular religion, often with negative connotations.