harmful
HARM-fuhl/ˈhɑɹmfl̩/UKHAHM-fuhl/ˈhɑːmfl̩/
- 1Able to hurt people, animals, or things, or to cause damage.
Like a poison that makes you sick if you swallow it.
Too much sun can be harmful to your skin.
These cleaning chemicals are harmful if you breathe them in.
Similardamaging, dangerous, detrimental, hazardous, injurious
Oppositeharmless, safe, beneficial, innocuous
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Origin
It comes from Old English, made from the word "harm" plus "-ful".