n.

The state or quality of being incredulous; disbelief.

noun

The refusal or reluctance to believe: disbelief, discredit, incredulousness, unbelief. See belief/unbelief.

IN BRIEF: Disbelief.

It is always well to accept your own shortcomings with candor but to regard those of your friends with polite incredulity. — Russell Lynes, U.S. editor, critic.

Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: doubt about the truth of something
  Synonyms: disbelief, skepticism, mental rejection

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Quotes:

"Incredulity is the wisdom of the fool." - Josh Billings

"Incredulity robs us of many pleasures, and gives us nothing in return." - James Russell Lowell

"The curse of man, and the cause of nearly all his woe, is his stupendous capacity for believing the incredible." - H. L. Mencken