1. causing great damage, harm, or failure; extremely bad or unsuccessful

Examples

• The hurricane had disastrous effects on the coastal towns.
• His first attempt at cooking dinner was absolutely disastrous.
• The company’s disastrous financial decisions led to bankruptcy.
• The team’s disastrous performance cost them the championship.
• Heavy rains caused disastrous flooding throughout the region.
• The movie was a disastrous flop at the box office.