Serious
Serious adjective - Not joking or playful in mood or manner.
Valid and serious are semantically related. In some cases you can use "Valid" instead an adjective "Serious".
Nearby Words: seriously, seriousness
Valid
Valid adjective - According to the rules of logic.
Serious and valid are semantically related. Sometimes you can use "Serious" instead an adjective "Valid".
Nearby Words: validity, validation
Mutual synonyms
Both words in one sentence
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Serious Business: Valid in the real world with tournaments, but taken to near-Yu-Gi-Oh!
Source: Tabletop Game / Pokémon -
Yes, Rudy may be insane, yes he may have kidnapped a woman, yes he may even be planning to rape and kill her and himself... but he's got some serious and perfectly valid reasons to be as messed up as he is.
Source: Series / Columbo -
After several non-consecutive centuries of political unity and cultural chauvinism, about four hundred years ago there became a serious case for asserting the pan-Chinese national identity as a valid one in itself.
Source: Take Over the World
Cite this Source
Valid and Serious. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/serious/valid
Serious & Valid. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/serious/valid>.
Valid or Serious. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/serious/valid.
Google Ngram Viewer shows how "serious" and "valid" have occurred on timeline