If something is feared, it means people are very worried about it or think it is very bad.
The word feared makes people think of being scared or in danger.
Examples:
The feared monster is very big and scary.
The dark forest is feared by many people.
She is going to the feared place.
The feared test is tomorrow, and I didn't study!
The feared dragon is as big as a house!
The feared ghost is hiding in the old house.