calamitous
adjective /kəˈlæmɪtəs/
  /kəˈlæmɪtəs/
(formal)- causing great damage to people’s lives, property, etc.(对人命、财产等)引起灾难的,灾难性的 - The bridge collapsed in the storm, with calamitous results.这座桥在暴风雨中倒塌了,造成了灾难性的后果。 
 
- The bridge collapsed in the storm, with calamitous results.