unjustifiable vs insupportable

unjustifiable and insupportable both are adjectives.

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

As adjectives, unjustifiable and insupportable are synonyms defined as:

unjustifiable and insupportable: incapable of being justified or explained

Other synonyms of unjustifiable include indefensible, unwarrantable, unwarranted.

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