7
unimpeachable(adjective, certainty)
6
convincing(adjective, sound, reasonable, certain, definite)
6
final(adjective, certain, definite, precise, sure)
6
unmistakable(adjective, clear, certain, definite, precise)
6
valid(adjective, clear, sound, right, reasonable)
5
decided(adjective, clear, severe, solid, certain)
5
demonstrable(adjective, demonstration, evident, provable)
5
evident(adjective, clear, material, certain, obvious)
5
inarguable(adjective, clear, certain, true, definite)
5
irresistible(adjective, demonstration)
5
obvious
5
real(adjective, clear, material, certain, sure)
5
solid(adjective, sound, reasonable, material, certain)
5
strong(sound, reasonable, rational)
5
unassailable(adjective, certain, true)
4
accurate(adjective, sound, reasonable, certain, rational)
4
assured(adjective, clear, certain, definite, sure)
4
definitive
4
proven(adjective, sound, reasonable, certain, rational)
4
set(adjective, clear, sound, firm, solid)
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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>