taciturnity
  沈默寡言,無言,不太說話
  Tac·i·tur·ni·ty n.  Habitual silence, or reserve in speaking.
     The cause of Addison's taciturnity was a natural diffidence in the company of strangers.   --V. Knox.
     The taciturnity and the short answers which gave so much offense.   --Macaulay.
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  taciturnity
       n : the trait of being uncommunicative; not volunteering
           anything more than necessary [syn: reserve, reticence]