disbelief

noun

1. (uncountable, usually)An unpreparedness, unwillingness, or an inability to believe that something is the case.

   “She cried out in disbelief on hearing that terrorists had crashed an airplane into the World Trade Center in New York City.”

2. (uncountable, usually)Astonishment.

   “I stared in disbelief at the Grand Canyon.”

3. (uncountable, usually)The loss or abandonment of a belief; the cessation of belief.

   “There is an agony of suffering in that lingering doubt which haunts the human soul in the beginnings of disbelief.”

   “No adolescent can achieve disbelief in the stork without an eruption of young oaths and cynicisms.”

   “His later left-wing films prevented any pure and strong emotional attachment between the two sexes from gaining narrative momentum, which might reflect his gradual disbelief in romantic love.”

   “Just like the disbelief in Santa Claus happens gradually, I wondered if it was similar for people leaving their faith.”