harmful
adjective
- tending to cause damage
Wiktionary
Pronunciation: /ˈhɑːmfl̩/ / /ˈhɑɹmfl̩/
adj
Etymology: From Middle English harmful, from Old English *hearmful (suggested by hearmfullīċ (“harmful; hurtful”)), equivalent to harm + -ful. Cognate with German harmvoll, Danish harmfuld, Swedish harmfull.
- Causing or likely to cause harm or damage; injurious.
“Wear a hat to protect your skin from harmful sunlight.”
“Smoking is harmful to the lungs.”