1. Susceptible to attack
   "a vulnerable bridge"
    
2. Capable of being wounded or hurt
   "vulnerable parts of the body"
    
3. Susceptible to criticism, persuasion or temptation
   "vulnerable to bribery"; "an argument vulnerable to refutation"

See also: assailable, compromising, conquerable, dangerous, defenceless [Brit, Cdn], defenseless [US], endangered, indefensible, insecure, open, out on a limb, penetrable, susceptible, threatened, undefendable, undefended, under attack, under fire, unguarded, unprotected, unsafe, weak

Antonym: invulnerable

Encyclopedia: Vulnerable