Definition of incredulous adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪnˈkredjələs//
; NAmE NAmE//ɪnˈkredʒələs//
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not willing or not able to believe something; showing an inability to believe something ‘Here?’ said Kate, incredulous. an incredulous look compare credulous Word Origin16th cent.: from Latin incredulus (from in- ‘not’ + credulus ‘believing, trusting’, from credere ‘believe’) + -ous.
See the Oxford Advanced American Dictionary entry: incredulous