insupportable vs unwarrantable

insupportable and unwarrantable both are adjectives.

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

As adjectives, insupportable and unwarrantable are synonyms defined as:

insupportable and unwarrantable: incapable of being justified or explained

Other synonyms of insupportable include indefensible, unjustifiable, unwarranted.

insupportable (adjective)	unwarrantable (adjective)
incapable of being justified or explained	incapable of being justified or explained