in ‧ cre ‧ du ‧ li ‧ ty /ˌɪnkrəˈdjuːləti, ˌɪnkrɪˈdjuːləti $ -ˈduː-/ BrE AmE noun [uncountable]
[ Word Family: adverb : ↑ incredibly , ↑ credibly , ↑ incredulously ; adjective : ↑ incredible , ↑ credible , ↑ incredulous ; noun : ↑ credibility , ↑ incredulity ]
a feeling that you cannot believe something SYN disbelief :
When she told her family she was gay, they reacted with a mixture of shock and incredulity.