authoritativeness

certain, sure, assured; solid, well-founded., unqualified, absolute, positive, determinate, definite, clear, unequivocal, categorical, unmistakable, decisive, decided, ascertained., inevitable, unavoidable, avoidless; ineluctable., unerring, infallible; unchangeable; to be depended on, trustworthy, reliable, bound., unimpeachable, undeniable, unquestionable; indisputable, incontestable, incontrovertible, indubitable; irrefutable (proven); conclusive, without power of appeal., indubious; without doubt, beyond a doubt, without a shade or shadow of doubt, without question, beyond question; past dispute; clear as day; beyond all question, beyond all dispute; undoubted, uncontested, unquestioned, undisputed; questionless, doubtless., authoritative, authentic, official.