anxiety 指对预料中的不祥之事的焦虑。
worry 侧重对未知事态演变的忧虑。
care 强调因出于责任感或顾虑等而产生的不安。
concern 作“关心”用时，是indifference(冷漠)的反义词，侧重对他人健康、安全等的关心，也可暗示对困难、危险或失败等的忧虑。
参考例句
1. She does not care very greatly for art. 她对艺术不十分感兴趣。
2. That, for all they care, I can go to hell. 尽管它们关怀备至，我亦有可能赶赴地府。
3. Something you can do for you to show yourself you care. 一件您做时可以用来展现您真正关心的事情。
英英解释
n.
1. the work of providing treatment for or attending to someone or something
2. judiciousness in avoiding harm or danger
3. an anxious feeling
4. a cause for feeling concern
5. attention and management implying responsibility for safety
6. activity involved in maintaining something in good working order v.
1. feel concern or interest
2. provide care for
3. prefer or wish to do something
4. be in charge of, act on, or dispose of
5. be concerned with
