dubiosity

noun

1. (countable, rare, uncountable)The state or characteristic of being dubious; a dubious assertion.

   “[M]en often ſwallow falſities for truths, dubioſities for certainties, feſibilities for poſſibilities, and things impoſſible as poſſibilities themſelves.”

   “Possibly perceiving an expression of dubiosity on their faces, the globetrotter went on adhering to his adventures.”