insupportable vs inexcusable

insupportable and inexcusable both are adjectives.

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

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