68 entries under sound topic. ×

2
believable(adjective, reasonable, rational, conceivable)
2
impregnable(adjective, reasonable, rational, safety)
2
valid(adjective, reasonable, rational, justified)
1
authoritative(adjective, reasonable, rational)
1
credible(adjective, reasonable, rational, conceivable)
1
official(adjective, reasonable, rational)
1
rational(adjective, reasonable, conceivable, tenable)
1
solid(reasonable, rational)
1
viable(adjective, reasonable, rational, conceivable)
0
accurate(reasonable, rational)
0
attested(reasonable, rational)
0
authentic(reasonable, rational)
0
binding(reasonable, rational)
0
bona fide(expression, reasonable, rational)
0
cogent(reasonable, rational)
0
compelling(reasonable, rational)
0
conclusive(reasonable, rational)
0
confirmed(reasonable, rational)
0
convincing(reasonable, rational)
0
determinative(reasonable, rational)
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APASmart Define. (2016). defensible thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/defensible/thesaurus/synonyms
ChicagoSmart Define. 2016. "defensible thesaurus" https://smartdefine.org/defensible/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, defensible thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/defensible/thesaurus/synonyms>.
MLASmart Define. "defensible thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/defensible/thesaurus/synonyms>