120 entries under sober topic. ×

3
hard-boiled(adjective, calm, hard, sound, tough)
3
philosophic(adjective, sound, reasonable, keen, sensible)
3
right-minded(adjective, reasonable, sensible, healthy, stable)
2
advisable(adjective, good, sound, reasonable, sensible)
2
arguable(adjective, sound, reasonable, sensible, intelligent)
2
canny(adjective, reasonable, smart, bright, intelligent)
2
careful(adjective, reasonable, sensible, restrained, modest)
2
cogitative(adjective, reasonable, keen, sensible, deep)
2
cognitive(adjective, sound, reasonable, sensible, intelligent)
2
considered(adjective, reasonable, sensible, deliberate, restrained)
2
contemplative(adjective, reasonable, keen, sensible, deep)
2
earnest(adjective, calm, quiet, reasonable, keen)
2
far-sighted(adjective, calm, sound, reasonable, sensible)
2
self-possessed(adjective, calm, sound, reasonable, sensible)
2
serious(adjective, calm, reasonable, keen, dark)
2
thought-out(adjective, sound, reasonable, sensible, intelligent)
2
unidealistic(adjective, hard, sound, reasonable, sensible)
2
useful(adjective, reasonable, sensible, real)
1
absorbed(adjective, reasonable, keen, deep, intelligent)
1
attentive(reasonable, thoughtful, realistic, perceptive)
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APASmart Define. (2016). rational thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/rational/thesaurus/synonyms
ChicagoSmart Define. 2016. "rational thesaurus" https://smartdefine.org/rational/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, rational thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/rational/thesaurus/synonyms>.
MLASmart Define. "rational thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/rational/thesaurus/synonyms>