indisputable

Synonyms: absolute accurate actual certain double-checked evident incontestable incontrovertible indubitable irrefutable no ifs ands or buts about it no mistake open and shut positive real sure that’s a fact true unassailable undeniable undoubted unfabled unquestionable veridical

Antonyms: disputable doubtful dubious indefinite questionable refutable uncertain unreliable unsure vague