Definition

Having a harmful effect or causing damage, often in a way that is not immediately obvious.

Example

The chemicals in the water were found to have deleterious effects on the local fish population.

Conversation

Have you heard about the deleterious effects of junk food on health?

Yeah, it's surprising how much it can impact our body.

I didn't realize it could be so deleterious until I read some articles.

Me neither! It's a good reminder to eat healthier.

Synonyms & Antonyms

Root Explanation

Deleterious → It is formed from 'deleterius' (from Latin, meaning harmful or destructive) and the suffix '-ous' (meaning full of). The word 'deleterious' means full of harm or having a harmful effect.

Memory Tip

Think of something that is 'full of harm' — 'deleterious' describes things that can be damaging or detrimental.

Visually Confused Words