Dictionary

incredulous

adjective in·cred·u·lous \(ˌ)in-ˈkre-jə-ləs, -dyə-ləs\

: not able or willing to believe something : feeling or showing a lack of belief

Full Definition of INCREDULOUS

1
:  unwilling to admit or accept what is offered as true :  not credulous :  skeptical
2
:  incredible 1
3
:  expressing incredulity <an incredulous stare>
in·cred·u·lous·ly adverb

Usage Discussion of INCREDULOUS

Sense 2 was revived in the 20th century after a couple of centuries of disuse. Although it is a sense with good literary precedent—among others Shakespeare used it—many people think it is a result of confusion with incredible, which is still the usual word in this sense.
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Examples of INCREDULOUS

  1. Afraid not. I made an expression to show that I was as incredulous about this as he was. —Bill Bryson, I'm a Stranger Here Myself, 1999

Origin of INCREDULOUS

Latin incredulus, from in- + credulus credulous
First Known Use: 1579
INCREDULOUSLY Defined for Kids

incredulous

adjective in·cred·u·lous \in-ˈkre-jə-ləs\

Definition of INCREDULOUS for Kids

:  feeling or showing disbelief
in·cred·u·lous·ly adverb

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