IPA: /ˈhɑːrmfəl.nəs/
KK: /ˈhɑrmfəl.nəs/
The quality or state of causing damage or injury.
The harmfulness of pollution is a major concern for the environment.
Harmfulness → It is formed from "harm" (from Old English "hearm", meaning damage or injury) and "-ful" (meaning full of) and "-ness" (meaning the state of). The word "harmfulness" means the state of being full of harm or causing damage.
Think of being 'full of harm' — 'harm' means damage, '-ful' means full of, and '-ness' indicates a state. This helps you remember that harmfulness refers to the state of causing damage.