incredulity

n. skepticism, disbelief, doubt

Noun
1. doubt about the truth of something
(synonym) disbelief, skepticism, mental rejection
(hypernym) doubt, uncertainty, incertitude, dubiety, doubtfulness, dubiousness

(n.)
The state or quality of being i/credulous; a withholding or refusal of belief; skepticism; unbelief; disbelief.
  

disbelief or skepticism.  We are incredulous when we are skeptical or disbelieving.  Lyotard made this an important concept for postmodernism by saying that postmoderns are incredulous
of metanarratives , that is, they are skeptical about claims that are overgeneralized.

n.
بے اعتقادي, بے اعتباري, بے بسواسي