indefensible vs insupportable

indefensible and insupportable both are adjectives.

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

As adjectives, indefensible and insupportable are synonyms defined as:

indefensible and insupportable: incapable of being justified or explained

Other synonyms of indefensible include unjustifiable, unwarrantable, unwarranted.

indefensible (adjective)	insupportable (adjective)
incapable of being justified or explained	incapable of being justified or explained
(of theories etc) incapable of being defended or justified
not able to be protected against attack