vulnerable vs undefended

vulnerable and undefended both are adjectives.

Word	Noun	Adjective	Verb	Adverb
vulnerable	No	Yes	No	No
undefended	No	Yes	No	No

vulnerable (adjective)	undefended (adjective)
susceptible to attack	not defended or capable of being defended
susceptible to criticism or persuasion or temptation
capable of being wounded or hurt