uncivilized vs uncivilised

uncivilized and uncivilised both are adjectives.

Word	Noun	Adjective	Verb	Adverb
uncivilized	No	Yes	No	No
uncivilised	No	Yes	No	No

As adjectives, uncivilized and uncivilised are synonyms defined as:

Other synonyms of uncivilized include barbarian, barbaric, savage, wild.

uncivilized (adjective)	uncivilised (adjective)
without civilizing influences	without civilizing influences