A calamitous event is one that leads to a catastrophe — like the calamitous crashing of your parents' car into the garage door.

Calamitous is an adjective that is generally used to describe events, and these events are disastrous or destructive. A failed election can be a calamitous event for a politician, especially if he loses by a landslide. Ever heard of Calamity Jane? She was known for her wild, calamitous behavior in the Wild West during the 19th century. Steer clear of anyone with a name like Calamity.

Definitions of calamitous
  1. adjective
    (of events) having extremely unfortunate or dire consequences; bringing ruin
    “a calamitous defeat”
    synonyms: black, disastrous, fatal, fateful
    not favored by fortune; marked or accompanied by or resulting in ill fortune
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