indefensible vs unwarranted

indefensible and unwarranted both are adjectives.

Word	Noun	Adjective	Verb	Adverb
indefensible	No	Yes	No	No
unwarranted	No	Yes	No	No

As adjectives, indefensible and unwarranted are synonyms defined as:

Other synonyms of indefensible include insupportable, unjustifiable, unwarrantable.

indefensible (adjective)	unwarranted (adjective)
incapable of being justified or explained	incapable of being justified or explained
(of theories etc) incapable of being defended or justified	lacking justification or authorization
not able to be protected against attack	without a basis in reason or fact