The definition of disastrous is something that is very harmful or damaging.adjective
An example of something disastrous is a tornado that destroys many homes.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Origin: Fr désastreux
- disastrously adverb
Used by arrangement with John Wiley & Sons, Inc.
- Accompanied by or causing distress or disaster; calamitous.
- Extremely bad; terrible: a disastrous report card.
- dis·asˈtrous·ly adverb
- dis·asˈtrous·ness noun