61 entries under sober topic. ×

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cool as cucumber(expression, idiom, calm, quiet, cool)
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decorous(adjective, calm, quiet, cool)
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deep(adjective, serious, solemn)
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demure(adjective, calm, quiet, cool)
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easy(adjective, reasonable, sensible, practical)
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fixed(adjective, thoughtful, serious, sincere)
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for real(expression, adjective, thoughtful, serious)
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hardboiled(adjective, reasonable, sensible, practical)
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intense(adjective, serious, grave, somber)
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lugubrious(dull, dark, gloomy, serious)
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mean business(expression, adjective, thoughtful, serious)
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no-fooling(adjective, thoughtful, serious, sincere)
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plainspoken(adjective, reasonable, sensible, practical)
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playing hard ball(expression, adjective, idiom, thoughtful)
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portentous(big, heavy, substantial, serious)
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proper(adjective, calm, quiet, cool)
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restrained(adjective, calm, quiet, reasonable, sensible)
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seemly(adjective, calm, quiet, cool)
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stable(adjective, thoughtful, serious, sincere)
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stolid(rational, straightforward, serious, sedate)
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APASmart Define. (2015). no-nonsense thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/no-nonsense/thesaurus/synonyms
ChicagoSmart Define. 2015. "no-nonsense thesaurus" https://smartdefine.org/no-nonsense/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, no-nonsense thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/no-nonsense/thesaurus/synonyms>.
MLASmart Define. "no-nonsense thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/no-nonsense/thesaurus/synonyms>