Preposterous
Preposterous adjective - So foolish or pointless as to be worthy of scornful laughter.
Usage example: the movie thriller had such a preposterous plot that we were on the edge of our seats snickering
Serious
Serious adjective - Not joking or playful in mood or manner.
Usage example: I'm serious when I say that no one should be walking in that neighborhood at night
Preposterous is an antonym for serious.
Nearby Words: seriously, seriousness
Both words in one sentence
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Poe's Law: Most of the positions stated and conclusions drawn in the tracts are so preposterous and illogical (not to mention un-Christian, at least to the majority of Christians) that it's hard to tell if Chick is being entirely serious.
Source: Comic Book / Chick Tracts
Cite this Source
Serious and Preposterous. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/preposterous/serious
Preposterous & Serious. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/preposterous/serious>.
Serious or Preposterous. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/preposterous/serious.
Google Ngram Viewer shows how "preposterous" and "serious" have occurred on timeline