noun

the state or quality of being doubtful; uncertainty.

his enemies made much of the dubiety of his paternity

doubtfulness,dubiousness,uncertainty,lack of certainty,unsureness,incertitude,ambiguity,ambivalence,confusion,scepticism,distrust,mistrust,lack of trust,suspicion,cynicism,disbelief,incredulity,unbelief,misbelief,lack of confidence/conviction,uneasiness,apprehension,wariness,chariness,questioning,reservations,misgivings,suspicions,qualms,leeriness,dubiosity