Ill
Ill adjective - Causing or capable of causing harm.
Usage example: one of the ill effects of winter weather is the rapid spread of germs as people spend more time together indoors
Pernicious is a synonym for ill in harmful topic. In some cases you can use "Pernicious" instead an adjective "Ill".
Nearby Word: illness
Pernicious
Pernicious adjective - Causing or capable of causing harm.
Usage example: the pernicious effects of illegal narcotics on society
Nearby Word: perniciously
Mutual synonyms
Cite this Source
Pernicious and Ill. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/ill/pernicious
Ill & Pernicious. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/ill/pernicious>.
Pernicious or Ill. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/ill/pernicious.
Google Ngram Viewer shows how "ill" and "pernicious" have occurred on timeline