Synonyms|4Antonyms|0|Broader|0Narrower|0Related|0
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be in earnest
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be serious
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mean business(verb, expression)
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mean it(verb, expression, phrasal verb)
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APASmart Define. (1970). be deadly serious thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/be_deadly_serious/thesaurus/synonyms
ChicagoSmart Define. 1970. "be deadly serious thesaurus" https://smartdefine.org/be_deadly_serious/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 1970, be deadly serious thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/be_deadly_serious/thesaurus/synonyms>.
MLASmart Define. "be deadly serious thesaurus" 1 January 1970. Web. 20 September 2026. <https://smartdefine.org/be_deadly_serious/thesaurus/synonyms>