Deadly
Deadly adjective - Likely to cause or capable of causing death.
Usage example: the doctors were alarmed about the outbreak of the deadly new virus
Poisonous is a synonym for deadly in property topic. In some cases you can use "Poisonous" instead an adjective "Deadly", when it comes to topics like foul, noxious, lethal, causing disease. popular alternative
Nearby Word: dead
Poisonous
Poisonous adjective - Containing or contaminated with a substance capable of injuring or killing a living thing.
Usage example: some evil person was leaving out poisonous meat for neighborhood dogs to eat
Deadly is a synonym for poisonous in toxic topic. You can use "Deadly" instead an adjective "Poisonous", if it concerns topics such as property, foul, harmful, venomous. popular alternative
Mutual synonyms
Related pairs
Both words in one sentence
-
They're so exotic and frightening-looking that the dragons unleash the (harmless) creatures upon human soldiers and bluff about how poisonous and deadly they are to scare them off.
Source: Literature / Dragon War -
Because Australia is so isolated from other landmasses, all the organisms living here are basically in an extreme evolutionary lensman arms race to be more deadly and poisonous and venomous than their competitors.
Source: Death World - However it also the home of all deadly and poisonous things.
Source: Death World
Cite this Source
Poisonous and Deadly. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/deadly/poisonous
Deadly & Poisonous. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/deadly/poisonous>.
Poisonous or Deadly. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/deadly/poisonous.
Google Ngram Viewer shows how "deadly" and "poisonous" have occurred on timeline