(n.) The quality or state of being infallible, or exempt from error; inerrability.

absolute certainty absoluteness assurance assuredness certain knowledge certainness certainty certitude chastity dead certainty defectlessness definiteness determinacy determinateness faultlessness finish flawlessness immaculateness impeccability ineluctability inerrability inerrancy inevitability infallibilism necessity nonambiguity noncontingency perfection positiveness predestination predetermination probatum proved fact purity sinlessness spotlessness stainlessness sureness surety taintlessness truth unambiguity unequivocalness univocity unmistakableness