THESAURUS
irrevocably
absolutely, certainly, clean, fatefully, indefeasibly, ineluctably, inescapably, inevasibly, inevitably, inexorably, inflexibly, irreclaimably, irrecoverably, irredeemably, irremediably, irreparably, irretrievably, irreversibly, necessarily, perfectly, plain, plumb, quite, relentlessly, right, sheer, stark, surely, unavoidably, uncontrollably, unpreventably, unrelievedly, unsalvably, unsalvageably, unyieldingly