adj. Susceptible to physical or emotional injury.adj. Susceptible to attack: "We are vulnerable both by water and land, without either fleet or army” ( Alexander Hamilton). adj. Open to censure or criticism; assailable.adj. Liable to succumb, as to persuasion or temptation.adj. Games In a position to receive greater penalties or bonuses in a hand of bridge. In a rubber, used of the pair of players who score 100 points toward game.