Synonyms|8Antonyms|80|Broader|0Narrower|0Related|10
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be deadly serious
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be determined
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be in earnest
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be resolute
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mean business(verb, expression)
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mean it(verb, expression, phrasal verb)
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mean what you say(verb, expression, idiom)
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not be joking(verb, expression, idiom)
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APASmart Define. (2013). be serious thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/be_serious/thesaurus/synonyms
ChicagoSmart Define. 2013. "be serious thesaurus" https://smartdefine.org/be_serious/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, be serious thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/be_serious/thesaurus/synonyms>.
MLASmart Define. "be serious thesaurus" 18 May 2013. Web. 20 September 2026. <https://smartdefine.org/be_serious/thesaurus/synonyms>