We have put together a list of words that are similar to CALAMITOUS.

8 Alternative Words Similar to calamitous

1 Black Adjective      Synonym Words Like Black
2 Disastrous Adjective      Synonym Words Like Disastrous
3 Fatal Adjective      Synonym Words Like Fatal
4 Fateful Adjective      Synonym Words Like Fateful
5 Unfortunate Adjective      Similar Words Like Unfortunate
6 Wretched Adjective      Synonym Words Like Wretched
7 Miserable Adjective      Synonym Words Like Miserable
8 Unhappy Adjective      Synonym Words Like Unhappy

5 examples of calamitous

1 a fateful error
2 it is fatal to enter any war without the will to win it
3 a calamitous defeat
4 the battle was a disastrous end to a disastrous campaign
5 such doctrines, if true, would be absolutely fatal to my theory

8 definitions of calamitous

1 Suffering calamity; wretched; miserable.
2 Producing, or attended with distress and misery; making wretched; wretched; unhappy.
3 (of events) having extremely unfortunate or dire consequences; bringing ruin
4 Causing or involving calamity; disastrous.
5 Miserable; involved in calamity or deep distress; wretched.
6 Of the nature of or marked by calamity or great misfortune; bringing or resulting from calamity; making wretched; distressing or distressful: as, a calamitous event; “that calamitous prison,” Milton, S.A.,1. 1480; “this sad and calamitous condition,” South.
7 Synonyms Afflictive, disastrous, distressing, grievous, deplorable, baleful, ruinous.
8 Concerning or involving calamity, disastrous.
We get our data from many different dictionaries across the web:
Wordnik, Wiktionary, Century, American Heritage, Gcide