Dreaded means terrible and greatly feared.
No one knew how to treat this dreaded disease.
没人知道如何治疗这种可怕的疾病。
You can use the dreaded to describe something that you, or a particular group of people, find annoying, inconvenient, or undesirable.
She's a victim of the dreaded hay fever.
她患了花粉热这种讨厌的病。