kəˈlaməd.əs, -ətəs adjective
Etymology: Middle French calamiteux, from Latin calamitosus, from calamitas calamity + -osus -ous
1. : marked by distress, affliction, or disaster:
a. : constituting or causing calamity : bringing distress
the calamitous disregard of mine-safety regulations
b. : concerned with or relating to disaster
this calamitous catalog of serious problems — J.J.McCloy
2. obsolete : involved personally in calamity
thou hast seen me happy and calamitous — Samuel Johnson
• ca·lam·i·tous·ly adverb