Synonyms|288Antonyms|51|Broader|1Narrower|0Related|376

50 entries under rational topic. ×

8
valid(adjective, good, sound, right, reasonable)
6
reasonable(adjective, sound, correct, reason, proper)
5
cogent(adjective, good, sound, correct, reasonable)
4
credible(good, sound, right, reasonable)
4
legal(good, sound, right, reasonable)
4
legitimate(good, sound, correct, right, reasonable)
4
solid(adjective, good, sound, right, reasonable)
4
substantial(good, sound, right, reasonable)
3
good(sound, right, reasonable, genuine)
3
justifiable(sound, reasonable, logical, understandable)
3
strong(good, sound, right, reasonable)
2
authoritative(good, sound, right, reasonable)
2
binding(sound, reasonable)
2
confirmed(good, sound, right, reasonable)
2
lawful(good, sound, right, reasonable)
2
logical(good, sound, right, reasonable)
2
trustworthy(good, sound, right, reasonable)
2
weighty(good, sound, right, reasonable)
1
accurate(sound, correct, reasonable, proper)
1
authentic(good, sound, right, reasonable)
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ChicagoSmart Define. 2016. "well-grounded thesaurus" https://smartdefine.org/well-grounded/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, well-grounded thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/well-grounded/thesaurus/synonyms>.
MLASmart Define. "well-grounded thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/well-grounded/thesaurus/synonyms>