The meaning of DISASTROUS is attended by or causing suffering or disaster : calamitous. How to use disastrous in a sentence.

DISASTROUS definition: 1. extremely bad or unsuccessful: 2. extremely bad or unsuccessful: 3. causing great harm…. Learn more.

DISASTROUS definition: causing great distress or injury; ruinous; very unfortunate; calamitous. See examples of disastrous used in a sentence.

Definition of disastrous adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

1. Accompanied by or causing distress or disaster; calamitous. 2. Extremely bad; terrible: a disastrous report card.

WordReference Random House Learner's Dictionary of American English © 2025 dis•ast•rous /dɪˈzæstrəs/ adj. of or relating to a disaster: a disastrous earthquake. performed or done very …

Aug 22, 2025 · disastrous (comparative more disastrous, superlative most disastrous)

disastrous meaning, definition, what is disastrous: very bad, or ending in failure: Learn more.

Disastrous means causing great damage, harm, or failure. It describes events or actions with extremely negative consequences, such as natural disasters or catastrophic mistakes. The …

If you describe something as disastrous, you mean that it was very unsuccessful. ...after their disastrous performance in the election.