126 entries under sober topic. ×

1
pragmatic(adjective, tough, rational, straightforward)
1
prosaic(adjective, tough, rational, straightforward)
1
prosy(adjective, tough, rational, straightforward)
1
rapt(adjective, reasonable, keen, deep, rational)
1
reasoning(adjective, reasonable, keen, deep, rational)
1
retrospective(adjective, reasonable, keen, deep, rational)
1
settled(adjective, strong, firm, sensible, steady)
1
soft(adjective, calm, quiet, gentle, sensible)
1
stable(adjective, strong, solid, big, important)
1
stoic(adjective, tough, rational, straightforward)
1
studious(adjective, reasonable, keen, deep, thoughtful)
1
subjective(adjective, reasonable, keen, deep, rational)
1
unaffected(adjective, open, tough, honest, true)
1
unembellished(adjective, tough, rational, straightforward)
1
unidealistic(adjective, tough, rational, straightforward)
1
unimaginative(adjective, tough, rational, straightforward)
1
unimpassioned(adjective, calm, tough, dark, restrained)
1
unsentimental(adjective, tough, rational, straightforward)
1
unvarnished(adjective, tough, rational, straightforward)
1
wise(adjective, reasonable, keen, heavy, deep)
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APASmart Define. (2016). serious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 27 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>