1. not based on or supported by historical facts or evidence
2. not concerned with or relating to history

Examples

• The movie’s portrayal of medieval life was completely unhistorical.
• Many folk tales contain unhistorical elements mixed with real events.
• The legend of King Arthur includes both historical and unhistorical details.
• Critics argued that the novel’s depiction of the war was unhistorical.
• The museum corrected several unhistorical claims in its exhibit.
• His unhistorical approach to the subject ignored important context.
• The documentary was criticized for its unhistorical interpretation of events.