Harmful
/ˈhɑːrmfəl/
Definitions
Causing or capable of causing harm; injurious; detrimental.
/ˈhɑːrmfəl/
Causing or capable of causing harm or damage.
The harmful effects of the chemical were quickly apparent.
💡 Simply: Harmful means something can hurt you or cause you problems. Like, eating too much candy is harmful to your teeth. Or, if your friend says mean things, that's harmful to your feelings.
👶 For kids: Something that is harmful can make you sick or hurt you.
More Examples
Exposure to the sun can be harmful to your skin.
He tried to warn her of the harmful consequences.
How It's Used
"The harmful effects of smoking on the lungs are well-documented."
"Pollution can be harmful to wildlife."
"Spreading rumors can be harmful to a person's reputation."
Synonyms & Antonyms
Synonyms
Antonyms
From Middle English harmeful, equivalent to harm + -ful. Harm comes from Old English hearma (“harm, damage, injury”).
The word 'harmful' has been in use since the 14th century, evolving from Middle English. Its meaning has remained relatively consistent.
Memory tip
Think of a 'harmful' substance as one that can cause physical or emotional harm.
Word Origin
"Damage, injury"