catastrophic

Definitions

Involving or causing sudden great damage or suffering.

Extremely unfortunate or unsuccessful.

Examples

The failure of the dam led to a catastrophic flood that devastated the entire valley.

The company suffered a catastrophic loss of data due to a major server malfunction.

Without immediate intervention, the environmental impact of the oil spill could be catastrophic.

Synonyms

disastrous devastating calamitous ruinous tragic cataclysmic fatal

Antonyms

beneficial fortunate favorable advantageous constructive prosperous successful