The root word for incredulous I think is incredible.
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A good word to use in place of incredulous is skeptical.
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How about skeptical, or unbelievable
Well the exact opposite of incredulous is credulous. Other words include believing, convinced, gullible, naïve, trusting and undoubting.
Incredulous - unbelieving. It applies to a person. A person can be incredulous (doesn't believe) Incredible-means unbelievable but the way it is used usually more like surprising. A thing or something is ikncredible somehing is unbelivable Eg. It is snowing in New York in march it is amazing Eg. The boy stared incredulously at the incredible sight of a UFO which landed in his backyatd