Deleterious and Secure
Opposite meaning words
Deleterious
Deleterious adjective - Causing or capable of causing harm.
Usage example: nicotine has long been recognized as a deleterious substance
Secure is an antonym for deleterious.
Secure
Secure adjective - Having or showing great faith in oneself or one's abilities.
Deleterious is an antonym for secure.
Cite this Source
Secure and Deleterious. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/deleterious/secure
Deleterious & Secure. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/deleterious/secure>.
Secure or Deleterious. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/deleterious/secure.
Google Ngram Viewer shows how "deleterious" and "secure" have occurred on timeline