Illegitimate and Preposterous

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Illegitimate adjective - Not using or following good reasoning.

Usage example: made several illegitimate inferences

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Preposterous and illegitimate are semantically related. In some cases you can use "Preposterous" instead an adjective "Illegitimate".

Preposterous adjective - Conceived or made without regard for reason or reality.

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Illegitimate and preposterous are semantically related. Sometimes you can use "Illegitimate" instead an adjective "Preposterous".

Cite this Source

Preposterous and Illegitimate. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/illegitimate/preposterous

Illegitimate & Preposterous. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/illegitimate/preposterous>.

Preposterous or Illegitimate. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/illegitimate/preposterous.

Google Ngram Viewer shows how "illegitimate" and "preposterous" have occurred on timeline