185 entries under rational topic. ×

5
accurate(adjective, good, correct, reasonable, appropriate)
5
authentic(adjective, correct, reasonable, honest, solid)
5
believable(adjective, reasonable, honest, sensible, solid)
5
compos mentis(expression, adjective, idiom, sensible)
5
down-to-earth(adjective, calm, hard, reasonable, sensible)
5
genuine(adjective, clear, correct, reasonable, firm)
5
pure(adjective, good, clear, great, reasonable)
5
right-minded(adjective, reasonable, sensible, healthy)
4
coherent(adjective, clear, reasonable, sensible, alert)
4
commonsense(hard, reasonable, sensible, practical)
4
matter-of-fact(adjective, hard, reasonable, sensible)
4
of sound mind(expression, idiom, sensible, healthy)
4
persuasive(adjective, clear, strong, direct, tough)
3
compelling(clear, reasonable, sensible, knowing)
3
discreet(adjective, reasonable, honest, sensible, fair)
3
discriminating(adjective, clear, reasonable, sensible, fair)
3
efficacious(reasonable, sensible, wise, shrewd)
3
efficient(adjective, strong, direct, tough, reasonable)
3
grave(adjective, calm, quiet, reasonable, dark)
3
informed(adjective, reasonable, sharp, sensible, ready)
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APASmart Define. (2016). sound thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/sound/thesaurus/synonyms
ChicagoSmart Define. 2016. "sound thesaurus" https://smartdefine.org/sound/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, sound thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/sound/thesaurus/synonyms>.
MLASmart Define. "sound thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/sound/thesaurus/synonyms>