inexcusable vs insupportable

inexcusable and insupportable both are adjectives.

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

inexcusable (adjective)	insupportable (adjective)
without excuse or justification	incapable of being justified or explained
not excusable