1The company's financial mismanagement led to a calamitous bankruptcy that affected thousands of employees.
2Was the failure of the dam a calamitous event, or could it have been prevented?
3The government's response to the natural disaster was widely criticized as inadequate and calamitous.
4Avoid actions that could lead to a calamitous outcome, such as ignoring safety protocols in a hazardous environment.
5Historians have long debated whether the decision to go to war was a calamitous mistake that led to decades of instability.