"make coarse, gross, or inhuman, lower to the level of a brute," 1740, from brutal + -ize. Related: Brutalized; brutalizing. An earlier verb was brutify (1660s), from French brutifier. Related: Brutification.
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Definitions of brutalization from WordNet
the condition of being treated in a cruel and savage manner;
the activity of treating someone savagely or viciously;
an act that makes people cruel or lacking normal human qualities;