banefully
/ˈbeɪnfəli/
adverb
- In a way that causes harm, ruin, or great trouble; destructively or perniciously.
- The policy banefully affected the local economy, leading to widespread unemployment.
- His banefully optimistic decisions ignored all the warning signs and ended in disaster.
- The invasive species spread banefully through the forest, killing native plants and animals.
Antonyms