禍 - calamity, misfortune, evil

COVID-19 pandemic; coronavirus crisis; COVID-19 crisis

root of an evil; source of a problem; source of trouble; cause of misfortune

war damage; ravages of war; horrors of war

careless remark; incriminating remark; unfortunate statement; slip of the tongue

to strike at the root of an evil

sink of iniquity

twilight (traditionally regarded as a time when accidents and disasters are frequent)

wickedness; evil; calamity; disaster

cause of trouble

fortune and misfortune; prosperity and adversity; good and evil; weal and woe

evil; harm; mischief

troubles brought on by what one has written