incredulous
Incredulous (adjective) means unwilling or unable to believe something, and showing it. Example: “She gave him an incredulous stare when he said he had walked the whole way.”
How to use incredulous
Learner’s notesIn plain EnglishYou can't believe what you have just heard.
Neutral to formal; very common in narrative writing.
The noun is incredulity, meaning the state of not believing something.
Trace the full origin ↓Fill the gap
Can you complete this real example?
She gave him an _____ stare when he said he had walked the whole way.
Etymology
From Latin incredulus, formed from in- 'not' and credulus 'believing', from credere 'to believe'.