incontrovertible
1. [ adjective ] impossible to deny or disprove
Synonyms: positive irrefutable
Examples:

"incontrovertible proof of the defendant's innocence" "proof positive" "an irrefutable argument"

Related terms: undeniable
2. [ adjective ] necessarily or demonstrably true
Synonyms: demonstrable
Examples:

"demonstrable truths"

Related terms: incontestable
Similar spelling:   incontrovertibly
  incontestible
  incontrovertibility
  incontestable