in·cred·u·lous /(ˌ)ɪnˈkrɛʤələs, djələs/
  (a.)懷疑的,不輕信的
  In·cred·u·lous a.
  1. Not credulous; indisposed to admit or accept that which is related as true, skeptical; unbelieving.
     A fantastical incredulous fool.   --Bp. Wilkins.
  2. Indicating, or caused by, disbelief or incredulity. “An incredulous smile.”
  3. Incredible; not easy to be believed. [R.]
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  incredulous
       adj : not disposed or willing to believe; unbelieving [ant: credulous]