uncontestable (adjective) incontrovertible: beyond dispute
Sinonime: accurate,
authentic,
certain,
established, incontestable, indisputable,
indubitable,
irrefutable, nailed down, no mistake, no two ways about it,
positive,
sure, sure thing, surefire, uncontestable,
undeniable, unequivocable, unquestionable, unshakable
Antonime: changeable, controvertible,
questionable,
uncertain,
variable