Preposterous
Preposterous adjective - Showing or marked by a lack of good sense or judgment.
Usage example: a preposterous suggestion to go swimming in this freezing weather
Valid is an antonym for preposterous.
Valid
Valid adjective - According to the rules of logic.
Usage example: your argument isn't valid because you're taking what should be the conclusion and using it as a premise
Preposterous is an antonym for valid.
Nearby Words: validity, validation
Both words in one sentence
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On the other hand, a mistyped word, proper noun, or even valid English word that isn't part of the dictionary (for whatever reason) can get "corrected" to something utterly preposterous, especially if the spell checker is set to "autocorrect".
Source: Rouge Angles of Satin
Cite this Source
Valid and Preposterous. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/preposterous/valid
Preposterous & Valid. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/preposterous/valid>.
Valid or Preposterous. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/preposterous/valid.
Google Ngram Viewer shows how "preposterous" and "valid" have occurred on timeline