If you fear someone or something, you are frightened because you think that they will harm you.
害怕 It seems to me that if people fear you they respect you.
A fear is a thought that something unpleasant might happen or might have happened.
担忧Then one day his worst fears were confirmed. 后来有一天,他最大的担心被证实了。
live in fear 生活在恐惧中
frighten = scare 是因某件突然的事情才让某人产生了害怕的情绪,句子后边的部分是人
horrify v. 使恐怖, 使极度厌恶, 惊骇
horrified adj. 惊悸的, 带有恐怖感的, 惊骇的