Invalid
Invalid adjective - Not using or following good reasoning.
Usage example: an argument which has one untrue premise is invalid
Persuasive is an antonym for invalid.
Persuasive
Persuasive adjective - Having the power to persuade.
Usage example: a persuasive argument for increasing funding of the city's library system
Both words in one sentence
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More formally, this is known as the "Argumentum ad Baculum" note Literally "appeal to the stick" or the Appeal to Force, whose logic goes essentially thus: "I'm right, and if you disagree, I beat or blow you up." While invalid in abstract logic, this tactic is rather persuasive in Real Life.
Source: Appeal to Force
Cite this Source
Persuasive and Invalid. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/invalid/persuasive
Invalid & Persuasive. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/invalid/persuasive>.
Persuasive or Invalid. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/invalid/persuasive.
Google Ngram Viewer shows how "invalid" and "persuasive" have occurred on timeline