in·cred·u·lous 
/ɪnˈkrɛʤələs/ adjective
/ɪnˈkrɛʤələs/ adjective [more incredulous; most incredulous] : not able or willing to believe something : feeling or showing a lack of belief
▪ She listened to his explanation with an incredulous smile. ▪ He was incredulous at the news. ▪ Many people were incredulous that such a small fire could have caused so much damage.
▪ She listened to his explanation with an incredulous smile. ▪ He was incredulous at the news. ▪ Many people were incredulous that such a small fire could have caused so much damage.
— in·cred·u·lous·ly adverb
▪ She listened incredulously as he explained his decision.
▪ She listened incredulously as he explained his decision.
