root of an evil; source of a problem; source of trouble; cause of misfortune
COVID-19 pandemic; coronavirus crisis; COVID-19 crisis
war damage; ravages of war; horrors of war
calamity; disaster; catastrophe
fortune and misfortune; prosperity and adversity; good and evil; weal and woe
calamity; disturbance; disorder; turmoil
traffic disaster; traffic accident
traffic accident; automobile accident
disaster caused by wind and rain
fortune follows the virtuous, calamity befalls the wicked; heaven rewards the good and punishes the evil