Vulnerable

vul·ner·a·ble \ adj \ˈvəl-n(ə-)rə-bəl 

1. capable of being physically or emotionally wounded 

2. open to attack or damage

Examples of VULNERABLE

1. She was very vulnerable after her brother died.
2. Her brother was in a vulnerable position when he was killed.
3. Her heart is now undefended and vulnerable.