In literature, an unreliable narrator is a character who tells a story with a lack of credibility. There are different types of unreliable narrators (more on that later), and the presence of one can be revealed to readers in varying ways — sometimes immediately, sometimes gradually, and sometimes later in the story when a plot twist leaves us wondering if we’ve maybe been a little too trusting.
An unreliable narrator is a narrator that isn’t a reliable source for your argument. Something that makes them unreliable is if your argument is about moving forward with something but the narrator is only talking about the opposite argument.