"Incredulous" means skeptical, unbelieving, or not willing or inclined to believe. For example, "When the manager claimed that his fund had earned 18% interest annually for the last three years, we were incredulous."
Sometimes people confuse "incredulous" with "incredible", which means unbelievable, usually in the sense of being amazing, as in an incredible performance or an incredible achievement. One way to remember the difference is that, in general, people are incredulous (doubting) about something, but things(e.g., events, claims, stories) are incredible.
Skeptical or unbelievable
"I find it incredulous that someone can have access to a computer and need to ask someone else how to find a piece of information; such as the definition of a word."
Incredulous
I am incredulous towards the bible.
The root word for incredulous I think is incredible.
His response left me incredulous.
You said you believe me, but your manner is incredulous.
I am incredulous that you can't come up with a sentence on your own.
A good word to use in place of incredulous is skeptical.
There is cred which means believe, and there is in which means not, so it means not believe.
The teacher was incredulous when the student claimed to have read the novel in two hours.
It is unbelieveable that my brother would not like chocolate!