vulnerable \VUL-nuh-ruh-bul\ adjective
Meaning
1: capable of being physically or emotionally wounded
*2: open to attack or damage : assailable

Bobby ran down the mountainside, not knowing whether the bear had followed or not. Below in the valley he saw the little house he and his brother had built last fall. Smoke was rising from the stack, and even from this distance, with the breeze in his direction, he could hear Sandy singing. She didn't know that her husband had nearly lost his arm. Or that blood was at this very minute gushing from a place so near his eye he wasn't sure he'd ever see properly again. She didn't know how vulnerable he was right now. All she knew was that the baby was sleeping, and, when the baby slept, she had peace.