How does poe use language to show his narrator is unreliable?

Poe uses language to show the narrator's unreliability through inconsistencies, exaggerations, and contradictions in the narration. The narrator may change details or present events in a distorted way, leading readers to question the accuracy of the account. Poe's use of unreliable language creates ambiguity and a sense of unease in the reader's interpretation of the narrator's mental state.