irrefutable (adj.)

• absolute
• actual
• admissible
• authentic
• certain
• circumstantial
• conclusive
• confirmable
• convincing
• cumulative
• damning
• decisive
• demonstrable
• determinative
• documentary
• documented
• evidential
• evidentiary
• factual
• final
• firsthand
• hearsay
• historical
• implicit
• incontestable
• incontrovertible
• indicative
• indisputable
• indubitable
• irresistible
• material
• overwhelming
• presumptive
• probative
• provable
• real
• reliable
• self-evident
• significant
• suggestive
• sure
• symptomatic
• telling
• testable
• unanswerable
• undeniable
• unimpeachable
• unquestionable
• valid
• verifiable
• weighty