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disastrous
adj
disaster
n
disastrously
adv
disastrously
adv
Example
The least mistake could be disastrous in this situation.
The storm's disastrous impact left thousands of homes without power.
The oil spill had disastrous effects on marine life and coastal ecosystems.
The invasive species had a disastrous effect on the local ecosystem.
Ignoring climate change could have disastrous consequences for future generations.