1.
If you are ~ to something or someone, you are very likely to be influenced by them.
Young people are the most ~ to advertisements...
James was extremely ~ to flattery...
ADJ: v-link ADJ to n
2.
If you are ~ to a disease or injury, you are very likely to be affected by it.
Walking with weights makes the shoulders very ~ to injury...
= vulnerable
ADJ: usu v-link ADJ to n