say it: di-ZA-struhs
disastrous is an adjective meaning "(of events) having extremely unfortunate or dire consequences; bringing ruin". It carries one recorded sense.
(of events) having extremely unfortunate or dire consequences; bringing ruin
“the stock market crashed on Black Friday”
“a calamitous defeat”
“the battle was a disastrous end to a disastrous campaign”
“such doctrines, if true, would be absolutely fatal to my theory”
“it is fatal to enter any war without the will to win it”
“a fateful error”
Definitions, synonyms and semantic relations for disastrous come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.