in·cre·du·li·ty /ˌɪnkrɪˈduləti, ˈdju-/
  不易相信,深疑,懷疑心
  In·cre·du·li·ty n.  The state or quality of being incredulous; a withholding or refusal of belief; skepticism; unbelief; disbelief.
     Of every species of incredulity, religious unbelief is the most irrational.   --Buckminster.
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  incredulity
       n : doubt about the truth of something [syn: disbelief, skepticism,
            mental rejection]