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
Infectious and deadly are semantically related. In some cases you can use "Infectious" instead an adjective "Deadly".
Nearby Word: dead
Infectious
Infectious adjective - Exciting a similar feeling or reaction in others.
Deadly and infectious are semantically related. Sometimes you can use "Deadly" instead an adjective "Infectious".
Mutual synonyms
Related pairs
Both words in one sentence
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Otaku: Mori, the office manager for the Department of Virology in the National Institute for Infectious Diseases, is an otaku for, of all things, deadly viruses.
Source: Manga / Emerging - Death Trap: Kappa arranges Bond and Reiko getting locked in their train compartment with the infectious mosquitos, switches off the lights in the train and then pulls the emergency brake lever to stop the train in a tunnel, leaving them alone in the darkness with the deadly insects.
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Fringe has a Shout-Out to Pandemic (see Video Games below) where there is a map showing a deadly infectious disease having spread everywhere but Madagascar.
Source: Spreading Disaster Map Graphic
Cite this Source
Infectious and Deadly. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/deadly/infectious
Deadly & Infectious. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/deadly/infectious>.
Infectious or Deadly. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/deadly/infectious.
Google Ngram Viewer shows how "deadly" and "infectious" have occurred on timeline