Harmless
Harmless adjective - Not causing or being capable of causing injury or hurt.
Infectious is an antonym for harmless.
Infectious
Infectious adjective - Exciting a similar feeling or reaction in others.
Both words in one sentence
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Just as infectious as the rest, but nigh-harmless to the experienced.
Source: Webcomic / The Zombie Hunters - In Stand Still, Stay Silent the world governments pretended that the "rash sickness" was infectious but mostly harmless and that the patients zero were responding well to treatment, and said that they were closing borders to travel simply because an epidemic would temporarily cripple the workforce.
Source: Apocalyptic Gag Order
Cite this Source
Infectious and Harmless. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/harmless/infectious
Harmless & Infectious. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/harmless/infectious>.
Infectious or Harmless. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/harmless/infectious.
Google Ngram Viewer shows how "harmless" and "infectious" have occurred on timeline