Grim
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
Grim is a synonym for serious in solemn topic. Sometimes you can use "Grim" instead an adjective "Serious", if it concerns topics such as somber, important, crucial.
Nearby Words: seriously, seriousness
Mutual synonyms
Both words in one sentence
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Megatron is less extreme, but still fills a similar role: apart from a bit of snark every now and then, he's too naturally grim and serious to be a traditional comedic mainstay.
Source: The Comically Serious -
However, Shinigami-sama's goofball moments were the result of him adapting a more holly personality since his grim and serious demeanor from centuries ago wasn't exactly the best for being in charge of a school; he still knows when to be deathly serious.
Source: Wacky Parent, Serious Child -
Lighter and Softer: Instead of Altaïr, the grim and serious master assassin from the first game, the player controls Ezio, a happy and playful nobleman in Florence.
Source: Video Game / Assassin's Creed II
Cite this Source
Serious and Grim. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/grim/serious
Grim & Serious. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/grim/serious>.
Serious or Grim. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/grim/serious.
Google Ngram Viewer shows how "grim" and "serious" have occurred on timeline