cruel vs barbarous

cruel and barbarous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
cruel	No	Yes	No	No
barbarous	No	Yes	No	No

As adjectives, cruel and barbarous are synonyms defined as:

cruel and barbarous: (of persons or their actions) able or disposed to inflict pain or suffering

Other synonyms of cruel include brutal, fell, roughshod, savage, vicious.

cruel (adjective)	barbarous (adjective)
(of persons or their actions) able or disposed to inflict pain or suffering	(of persons or their actions) able or disposed to inflict pain or suffering
	primitive in customs and culture