baneful

/ˈbeɪnfəl/
adjective
  1. Causing harm, destruction, or serious trouble; harmful or deadly.
    • The ancient legend spoke of a baneful curse that brought famine to the land.
    • The baneful effects of pollution can be seen in the dying coral reefs.
    • His baneful influence on the team led to constant arguments and low morale.
What does "baneful" mean? | whatsthatwordmean | whatsthatwordmean