capable of or susceptible to being wounded or hurt, as by a weapon

a vulnerable part of the body.

open to moral attack, criticism, temptation, etc.

an argument vulnerable to refutation; He is vulnerable to bribery.

(of a place) open to assault; difficult to defend

a vulnerable bridge.

Bridge . having won one of the games of a rubber.

adjective

closed , guarded , protected , safe , secure

adjective

accessible , assailable , defenseless , exposed , liable , naked , on the line , on the spot , out on a limb * , ready , sensitive , sitting duck * , sucker , susceptible , tender , thin-skinned * , unguarded , unprotected , unsafe , weak , wide open , open , prone , subject , susceptive , attackable , pregnable , vincible , insecure