Collocations for vulnerable - adj.

be, prove
appear, feel, look, seem
You must try not to appear vulnerable.

become
remain
leave sb/sth, make sb/sth, render sb/sth
The virus attacks the immune system, leaving your body vulnerable to infections.

extremely, fairly, very, etc.
She is very sensitive and rather vulnerable.

acutely, especially, highly, particularly
completely, totally
increasingly
potentially
peculiarly, uniquely
Hippos are uniquely vulnerable to drought.

oddly (esp. AmE), strangely (esp. BrE)
He smiled, making her suddenly feel oddly vulnerable.

economically, politically
The company is in an economically vulnerable position.

emotionally, psychologically

to
These offices are highly vulnerable to terrorist attack.

Vulnerable is used with these nouns:
economy, patient, people, personality, position, situation, spot, stage, target