barbarian

bar|bar|ian /bɑːrb'eəriən/ (barbarians)
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In former times, barbarians were people from other countries who were thought to be uncivilized and violent.
The Roman Empire was overrun by Nordic barbarians.
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If you describe someone as a barbarian, you disapprove of them because they behave in a way that is cruel or uncivilized.
Our maths teacher was a bully and a complete barbarian...
We need to fight this barbarian attitude to science.