Incredulity :: Incredulity (n.) The state or quality of being i/credulous; a withholding or refusal of belief; skepticism; unbelief; disbelief.
Miscredulity :: Miscredulity (n.) Wrong credulity or belief; misbelief.
Sedulity :: Sedulity (n.) The quality or state of being sedulous; diligent and assiduous application; constant attention; unremitting industry; sedulousness.