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English definition of “skeptic”

skeptic

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