1. susceptible to attack or harm
be put in a vulnerable position
The adjective 'vulnerable' describes something or someone who is especially liable or at risk of being attacked or harmed physically or emotionally. Someone might be vulnerable due to their age, special needs or disadvantage. These kinds of people can be described as 'vulnerable people', people who it might be easier to take advantage of. A country might be 'vulnerable to attack' if they don't have adequate defences.