All 5 Uses

vulnerable
in
The Chocolate War
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Archie became absolutely still, afraid that the rapid beating of his heart might betray his sudden knowledge, the proof of what he'd always suspected, not only of Brother Leon but most grownups, most adults: they were vulnerable, running scared, open to invasion.†
Chpt 4 *
His face was always under control but his eyes showed his vulnerability, gave Jerry a glimpse into the hell that was burning inside the teacher.†
Chpt 18
Jerry leaped toward him, low, aiming for that vulnerable territory of the knees, the target pinpointed by the coach.†
Chpt 28
At least if he carried the ball, he'd be in full view of everyone and not as vulnerable to a sneak attack.†
Chpt 28

vulnerable to = easily hurt by; or easily influenced or tempted by; or "easily hurt" to
"You listen," Janza said, cool now, knowing he had struck a vulnerable spot.†
Chpt 31

Definitions:

(1) (vulnerable)
easily hurt or in need of help; or easily influenced or subject to temptation
(2) (meaning too rare to warrant focus)
Specialized Definitions for vulnerable:

Ecology: species believed likely to move into the endangered category if no action is taken

Bridge (card game): the period after winning one game in a rubber when higher penalties (and bonuses) are scored