cat·a·clysm 
/ˈkætəˌklɪzəm/ noun
plural cat·a·clysms /ˈkætəˌklɪzəm/ noun : something that causes great destruction, violence, etc. [count] ▪ floods, earthquakes, and other cataclysms ▪ The country barely survived the cataclysm of war. [noncount] ▪ The revolution could result in worldwide cataclysm.
— cat·a·clys·mic /ˌkætəˈklɪzmɪk/ adjective [more cataclysmic; most cataclysmic]
▪ a cataclysmic event
/ˌkætəˈklɪzmɪk/ adjective [more cataclysmic; most cataclysmic] ▪ a cataclysmic event
