undefendable vs vulnerable

undefendable and vulnerable both are adjectives.

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

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