Unimpeachable

Adjective

 * 1) not able to be impeached or reproached
 * 2) blameless
 * 3) beyond doubt

Thesaurus
Christian, above suspicion, absolute, actual, admitting no question, believable, blameless, clean, colorable, conceivable, confirmable, credible, creditable, decent, demonstrable, demonstratable, erect, estimable, ethical, factual, fair, fiduciary, full of integrity, good, high-minded, high-principled, highly respectable, historical, honest, honorable, immaculate, inappealable, incontestable, incontrovertible, inculpable, indisputable, indubitable, inviolate, irrefragable, irrefutable, irreprehensible, irreproachable, irreprovable, just, law-abiding, law-loving, law-revering, manly, moral, noble, plausible, principled, provable, pure, real, reliable, reputable, respectable, right, right-minded, righteous, self-evident, spotless, stainless, sterling, tenable, testable, true-dealing, true-devoted, true-disposing, true-souled, true-spirited, truehearted, trustworthy, trusty, unanswerable, unarraignable, unblamable, unblameworthy, unblemished, uncensurable, unconfutable, uncorrupt, uncorrupted, undefiled, undeniable, unexceptionable, unindictable, unobjectionable, unquestionable, unrefutable, unspotted, unstained, unsullied, untarnished, upright, uprighteous, upstanding, verifiable, virtuous, worthy, worthy of faith, yeomanly