A soothsayer is a person who is believed to be able to see the future or tell people what will happen.
In stories, soothsayers are often mysterious and wise, but in real life, people might not believe in soothsayers.
Examples:
The soothsayer told the king that something bad would happen.
In the story, the soothsayer knew what was going to happen.
The soothsayer's words came true.
The soothsayer said I would find a giant cookie, but I didn't.
The soothsayer could see a hundred years into the future.
The soothsayer's eyes were as big as the moon when he told us what would happen.