56 entries under sound topic. ×

7
unanswerable(adjective, reasonable, definite, precise)
6
convincing(adjective, reasonable, certain, definite)
6
valid(adjective, clear, right, reasonable)
5
solid(adjective, reasonable, material, certain)
5
strong(reasonable, rational)
4
accurate(adjective, reasonable, certain, rational)
4
proven(adjective, reasonable, certain, rational)
4
set(adjective, clear, firm, solid)
3
authoritative(clear, reasonable, certain, rational)
3
good(reasonable, rational)
3
weighty(reasonable, rational)
2
authentic(reasonable, material, certain, rational)
2
cogent(reasonable, rational, definite, precise)
2
determinative(reasonable, rational, definite, precise)
2
fixed(adjective, clear, firm, plain)
2
official(reasonable, rational, reliable)
2
persuasive(adjective, reasonable, rational)
2
powerful(reasonable, rational)
2
substantial(reasonable, physical, material, rational)
2
telling(reasonable, rational, definite, precise)
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APASmart Define. (2015). irrefutable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/irrefutable/thesaurus/synonyms
ChicagoSmart Define. 2015. "irrefutable thesaurus" https://smartdefine.org/irrefutable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, irrefutable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/irrefutable/thesaurus/synonyms>.
MLASmart Define. "irrefutable thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/irrefutable/thesaurus/synonyms>