atroc·i·ty 
/əˈtrɑ:səti/ noun
plural atroc·i·ties /əˈtrɑ:səti/ noun : a very cruel or terrible act or action [count] ▪ the atrocities of war ▪ Atrocities were committed by forces on both sides of the conflict. [noncount] ▪ Who could be capable of such atrocity?
