Synonyms|359Antonyms|67|Broader|1Narrower|0Related|355

47 entries under rational topic. ×

13
good(sound, right, reasonable, genuine)
12
sound(adjective, calm, good, strong, secure)
11
solid(adjective, calm, good, strong, sound)
10
valid(adjective, good, sound, right, reasonable)
7
reasonable(adjective, sound, correct, reason, sensible)
6
substantial(adjective, calm, good, strong, sound)
6
true(sound, reasonable, absolute, valid)
5
weighty(good, sound, right, reasonable)
4
credible(good, sound, right, reasonable)
4
trustworthy(good, sound, right, reasonable)
3
authentic(good, sound, right, reasonable)
3
authoritative(good, sound, right, reasonable)
3
confirmed(good, sound, right, reasonable)
3
convincing(sound, reasonable)
3
genuine(good, sound, right, reasonable)
3
justifiable(adjective, sound, reasonable, valid)
3
lawful(adjective, good, sound, right, reasonable)
3
legal(good, sound, right, reasonable)
3
potent(good, strong, sound, right, reasonable)
3
powerful(adjective, good, strong, great, sound)
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ChicagoSmart Define. 2016. "well-founded thesaurus" https://smartdefine.org/well-founded/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, well-founded thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/well-founded/thesaurus/synonyms>.
MLASmart Define. "well-founded thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/well-founded/thesaurus/synonyms>