able to be easily physically or mentally hurt, influenced, or attacked

I felt very vulnerable, standing there without any clothes on. 一丝不挂地站在那儿，我感觉自己不堪一击。

It is on economic policy that the government is most vulnerable. 政府最易受人诟病的是经济政策。

Tourists are more vulnerable to attack, because they do not know which areas of the city to avoid. 游客更容易受到攻击，因为他们不知道城里哪些地方不该去。