unwarranted vs unjustifiable

unwarranted and unjustifiable both are adjectives.

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

As adjectives, unwarranted and unjustifiable are synonyms defined as:

unwarranted and unjustifiable: incapable of being justified or explained

Other synonyms of unwarranted include indefensible, insupportable, unwarrantable.

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