84 entries under rational topic. ×

1
prosaic(adjective, tough, straightforward, sober)
1
prosy(adjective, tough, straightforward, sober)
1
rapt(adjective, reasonable, keen, deep)
1
reasoning(adjective, reasonable, keen, deep)
1
retrospective(adjective, reasonable, keen, deep)
1
stoic(adjective, tough, straightforward, sober)
1
subjective(adjective, reasonable, keen, deep)
1
unaffected(adjective, open, tough, honest, true)
1
unembellished(adjective, tough, straightforward, sober)
1
unexcited(adjective, calm, sensible, dark, restrained)
1
unidealistic(adjective, tough, straightforward, sober)
1
unimaginative(adjective, tough, straightforward, sober)
1
unimpassioned(adjective, calm, tough, dark, restrained)
1
unsentimental(adjective, tough, straightforward, sober)
1
unvarnished(adjective, tough, straightforward, sober)
0
abnegating(adjective, calm, sensible, dark, restrained)
0
constrained(adjective, calm, sensible, dark, restrained)
0
eschewing(adjective, calm, sensible, dark, restrained)
0
forgoing(adjective, calm, sensible, dark, restrained)
0
literal(straightforward, down-to-earth)
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APASmart Define. (2016). serious thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 25 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>