Harmful and Hazardous

Harmful

Harmful adjective - Causing or capable of causing harm.
Usage example: DDT has been proven to be extremely harmful to the environment

Hazardous is a synonym for harmful in noxious topic. In some cases you can use "Hazardous" instead the word "Harmful" as an adjective or a noun, when it comes to topics like damaging.

Hazardous

Hazardous adjective - Involving potential loss or injury.
Usage example: a hazardous journey across the arctic ice

Harmful is a synonym for hazardous. You can use "Harmful" instead the word "Hazardous" as an adjective or a noun.

Nearby Words: hazard, hazarded, hazardously
Cite this Source
Hazardous and Harmful. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/harmful/hazardous
Harmful & Hazardous. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/harmful/hazardous>.
Hazardous or Harmful. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/harmful/hazardous.
Google Ngram Viewer shows how "harmful" and "hazardous" have occurred on timeline