indeˈfeasiblenessn. the quality or character of being indefeasible.
ΘΚΠ
the mind > mental capacity > belief > uncertainty, doubt, hesitation > absence of doubt, confidence > assured fact, certainty > certain prospect or possession > [noun] > of a title
indefeasiblenessa1754
indefeasibility1828
a1754 T. CarteGen. Hist. Eng. (1755) IV. 2 The indefeasableness of the succession seems to be a natural consequence of its being a lineal one.