Fatal
Fatal adjective - Likely to cause or capable of causing death.
Usage example: that snake's venom is fatal unless the victim is given the antidote almost immediately
Poisonous is a synonym for fatal in property topic. In some cases you can use "Poisonous" instead an adjective "Fatal", when it comes to topics like deadly. popular alternative
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
Fatal is a synonym for poisonous in toxic topic. You can use "Fatal" instead an adjective "Poisonous", if it concerns topics such as property, deadly, harmful. popular alternative
Mutual synonyms
Related pairs
Both words in one sentence
- The canister being labelled "deadly helium" suggests the writers thought the idea wasn't supposed to make sense, but that much helium really would be fatal: even if it isn't poisonous, displacing that much oxygen would cause asphyxiation.
Source: Accidentally Accurate -
Strong acid is also extremely poisonous to breathe, so the air would be fatal long before its first victim could fall into it, unless it was from a substantial height; and even then it would have a substantial stench even from a great distance, which would drive anyone away if they had a choice.
Source: Acid Pool -
He's later seen as a Brick Joke to have survived many fatal injuries and the thing that finally kills him are poisonous berries.
Source: Western Animation / Mr. Pickles
Cite this Source
Poisonous and Fatal. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/fatal/poisonous
Fatal & Poisonous. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/fatal/poisonous>.
Poisonous or Fatal. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/fatal/poisonous.
Google Ngram Viewer shows how "fatal" and "poisonous" have occurred on timeline