The phrase "disastrous impact" means that something has caused a very bad, destructive, or harmful effect on a situation, person, or thing. Full definition
The proposed limit to child tax credit to two children will have a potentially disastrous impact on tens of thousands of kinship carers and their children. (frg.org.uk)
If this sum is invested in low - carbon growth, we have a fighting chance at avoiding the most disastrous impacts of climate change. (earthjustice.org)
Learning to actually recognize emotions like fear & greed in yourself, and their potentially disastrous impact on your investing, is the first & likely most difficult part of the battle you face. (wexboy.wordpress.com)