dubiousness

noun

1. (uncountable, usually)The state of being dubious or suspicious.

   “The dubiousness of the old rope bridge deterred me from trying to cross.”

2. (uncountable, usually)Doubt; uncertainty.

   “All his occasional pangs of dubiousness as to the grand governing thing of all—the reality of the physical relationship—only recoiled back upon him with added tribute of both certainty and insolubleness.”