Harmful
Harmful adjective - Causing or capable of causing harm.
Usage example: DDT has been proven to be extremely harmful to the environment
Unhealthy is a synonym for harmful in damaging topic. In some cases you can use "Unhealthy" instead an adjective "Harmful", when it comes to topics like injurious, deleterious. popular alternative
Unhealthy
Unhealthy adjective - Involving potential loss or injury.
Usage example: criticism of the military dictatorship has proved to be unhealthy for several of that nation's journalists
Harmful is a synonym for unhealthy in deleterious topic. You can use "Harmful" instead an adjective "Unhealthy", if it concerns topics such as very bad in effect on well-being. popular alternative
Nearby Word: unhealthily
Mutual synonyms
Related pairs
Both words in one sentence
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The third movie portrays Homura's devotion to Madoka as emotionally unhealthy and harmful to both of them.
Source: Do Not Do This Cool Thing -
Heterosexual Life-Partners: Igor and Victor are close, but their friendship is an unhealthy one, and it's especially harmful for Igor.
Source: Film / Victor Frankenstein - Healthy-eating videos don't skimp on showing how harmful unhealthy food can be to the body, from clogged arteries, to heart attacks, to damaged liver.
Source: Scare 'Em Straight
Cite this Source
Unhealthy and Harmful. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/harmful/unhealthy
Harmful & Unhealthy. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/harmful/unhealthy>.
Unhealthy or Harmful. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/harmful/unhealthy.
Google Ngram Viewer shows how "harmful" and "unhealthy" have occurred on timeline