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English definition of “skeptic”

skeptic

noun [C]  /ˈskep·tɪk/ us  
a person who doubts the truth or value of an idea or belief
skeptical
adjective  /ˈskep·tɪ·kəl/ us  
They’re very skeptical of his motives.
skepticism
noun [U]  /ˈskep·təˌsɪz·əm/ us  
He displays a healthy skepticism toward his own beliefs.
(Definition of skeptic from the Cambridge Academic Content Dictionary © Cambridge University Press)
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