unwarranted vs indefensible

unwarranted and indefensible both are adjectives.

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

As adjectives, unwarranted and indefensible are synonyms defined as:

Other synonyms of unwarranted include insupportable, unjustifiable, unwarrantable.

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