Definition

Causing damage or injury to someone or something.

Example

Smoking is harmful to your health.

Comparatives & Superlatives

Conversation

Did you hear about that new chemical in the products?

Yeah, I heard it could be harmful to our health.

It's scary how many things we use daily might be dangerous.

I know, we should really pay more attention to what we buy.

Synonyms & Antonyms

Root Explanation

Harmful → It is formed from "harm" (from Old English *hearm*, meaning damage or injury) and "-ful" (meaning full of). The word "harmful" means full of harm or causing damage.

Memory Tip

Think of something that is 'full of harm' — that's why harmful means it causes damage.

Visually Confused Words