(a.) Not contestable; not to be disputed; that cannot be called in question or controverted; incontrovertible; indisputable; as, incontestable evidence, truth, or facts.

absolute actual admitting no question certain confirmable demonstrable demonstratable factual historical impenetrable impregnable inappealable incontrovertible indisputable indomitable indubitable inexpugnable insuperable invincible inviolable invulnerable irrefragable irrefutable irresistible overpowering overwhelming provable real resistless self-evident sure testable unanswerable unassailable unbeatable unconfutable unconquerable uncontestable undeniable unimpeachable unquestionable unrefutable unsubduable unsurmountable unyielding verifiable