[adj] susceptible to physical or emotional injury; "at a tender age"
[adj] capable of being wounded or hurt; "vulnerable parts of the body"
[adj] susceptible to criticism or persuasion or temptation; "vulnerable to bribery"; "an argument vulnerable to refutation"
[adj] susceptible to attack; "a vulnerable bridge"
assailable, compromising, defenceless, defenseless, endangered, immature, insecure, open, penetrable, susceptible, tender, threatened, undefendable, undefended, under attack(p), under fire(p), unguarded, unprotected, weak, young