Deadly
Deadly adjective - Likely to cause or capable of causing death.
Ineffectual is an antonym for deadly.
Nearby Word: dead
Ineffectual
Ineffectual adjective - Producing no results.
Usage example: another ineffectual plan to lose weight without dieting or exercising
Deadly is an antonym for ineffectual.
Nearby Words: ineffective, ineffectively
Both words in one sentence
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The original Sweeps were just mooks and often ended up as Ineffectual Sympathetic Villains; here, they are still Mooks who go down en masse, but they're a lot more deadly, storming Kimia and killing most of the crew, even tearing one bot apart with their teeth.
Source: Adaptational Badass
Cite this Source
Ineffectual and Deadly. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/deadly/ineffectual
Deadly & Ineffectual. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/deadly/ineffectual>.
Ineffectual or Deadly. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/deadly/ineffectual.
Google Ngram Viewer shows how "deadly" and "ineffectual" have occurred on timeline