All 3 Uses

vulnerable
in
She Said Yes
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But emotions are a fickle thing, and even though I am certain that with prayer and time I will find the same healing he has, I struggle with feelings of loneliness and vulnerability and the temptation to despair.†
p. 37.7
We loved the neighborhood we were living in, and we loved our house, but we couldn't see keeping Cassie in such a vulnerable position.†
p. 86.8 *
Cassie wasn't confident or especially outgoing by nature, and I can't imagine how difficult it must have been for her to make herself vulnerable in this way.†
p. 139.3

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