1. a. Susceptible to physical harm or damage: trees that are vulnerable to insects.
b. Susceptible to emotional injury, especially in being easily hurt: a lonely child who is vulnerable to teasing.
c. Susceptible to attack: “We are vulnerable both by water and land, without either fleet or army” (Alexander Hamilton).
d. Open to censure or criticism; assailable: The mayor is vulnerable to criticism on the issue.
e. Susceptible to loss or poor performance: a team that is vulnerable going into the tournament.