/ ˈbɑːbərəs; NAmE ˈbɑːrb-/ adjective ( formal )
1.
extremely cruel and shocking :
the barbarous treatment of these prisoners of war
2.
showing a lack of education and good manners
► bar·bar·ous·ly adverb
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WORD ORIGIN
late Middle English (in sense 2): via Latin from Greek barbaros foreign + -ous .