Pronunciation: (vul'nur-u-bul),[key] —adj. 1. capable of or susceptible to being wounded or hurt, as by a weapon: a vulnerable part of the body. 2. open to moral attack, criticism, temptation, etc.: an argument vulnerable to refutation; He is vulnerable to bribery. 3. (of a place) open to assault; difficult to defend: a vulnerable bridge. 4. Bridge.having won one of the games of a rubber.