calamitous vs disastrous

calamitous and disastrous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
calamitous	No	Yes	No	No
disastrous	No	Yes	No	No

As adjectives, calamitous and disastrous are synonyms defined as:

calamitous and disastrous: (of events) having extremely unfortunate or dire consequences; bringing ruin

Other synonyms of calamitous include black, fatal, fateful.

calamitous (adjective)	disastrous (adjective)
(of events) having extremely unfortunate or dire consequences; bringing ruin	(of events) having extremely unfortunate or dire consequences; bringing ruin