1. a person who believes in or predicts apocalypse; someone who interprets or writes about end-times prophecies
Usage: often used in religious or theological contexts; can be neutral or slightly pejorative depending on context
2. a writer or scholar who studies apocalyptic literature or theology
Usage: academic or scholarly usage

Examples

• The apocalyptist warned that the end times were near.
• Medieval apocalyptists produced elaborate visions of the final judgment.
• Some apocalyptists interpret current events as signs of the coming apocalypse.
• The scholar is an expert apocalyptist who has published extensively on biblical prophecy.
• Not all apocalyptists agree on the timeline of future events.
• The apocalyptist's predictions have not come to pass as expected.