506 entries under adjective topic. ×

9
thoughtful(good, sound, reasonable, sensible)
9
acceptable(sound, reasonable, honest, solid)
8
all there(expression, idiom, calm, good)
8
analytical(clear, sound, reasonable, reason)
8
brainy(understanding, reasonable, keen, sharp)
8
consequent(good, clear, sound, reasonable)
8
credible(sound, reasonable, sensible, solid)
8
discerning(clear, understanding, sound, reasonable)
8
informed(reasonable, sensible, stable, intelligent)
8
justifiable(clear, sound, reasonable, honest)
8
knowledgeable(smart, experience, know, capable)
8
levelheaded(calm, good, quiet, hard)
8
mental(mind, intelligent, thoughtful, intellect)
8
responsible(smart, bright, deliberate, mature)
8
sapient(sound, reason, sensible, proper)
8
stable(sound, reasonable, sensible, normal)
7
believable(sound, reasonable, honest, sensible)
7
clear-headed(calm, quiet, reasonable, sensible)
7
cogent(clear, sound, reasonable, sensible)
7
coherent(clear, sound, reasonable, sensible)
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APASmart Define. (2016). rational thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/rational/thesaurus/synonyms
ChicagoSmart Define. 2016. "rational thesaurus" https://smartdefine.org/rational/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, rational thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rational/thesaurus/synonyms>.
MLASmart Define. "rational thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/rational/thesaurus/synonyms>