The effects of this disease are horrible. You wouldn't wish them on your worst enemy.这种病的症状极其可怕。你甚至都不希望自己的死敌遭那样的罪。This is extremely frightening for elderly people.这对老年人来说极其可怕。The hostages were eventually released after undergoing a terrifying ordeal.人质在经历了极其可怕的折磨之后终于获释。