cre ‧ du ‧ li ‧ ty /krɪˈdjuːləti, krɪˈdjuːlɪti $ -ˈduː-/ BrE AmE noun [uncountable] formal
willingness or ability to believe that something is true ⇨ incredulity :
Advertisers were accused of exploiting consumers’ credulity.
strain/stretch credulity (=seem very difficult to believe)
It strained credulity to believe that a nuclear war would not lead to the destruction of the planet.