unwarranted vs insupportable

unwarranted and insupportable both are adjectives.

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

As adjectives, unwarranted and insupportable are synonyms defined as:

unwarranted and insupportable: incapable of being justified or explained

Other synonyms of unwarranted include indefensible, unjustifiable, unwarrantable.

unwarranted (adjective)	insupportable (adjective)
incapable of being justified or explained	incapable of being justified or explained
lacking justification or authorization
without a basis in reason or fact