tac·i·turn /ˈtæsəˌtɚ/
  (a.)沈默寡言的,不太說話的,無言的
  Tac·i·turn a.  Habitually silent; not given to converse; not apt to talk or speak. -- Tac*i*turn*ly, adv.
  Syn: -- Silent; reserved.
  Usage: Taciturn, Silent. Silent has reference to the act; taciturn, to the habit.  A man may be silent from circumstances; he is taciturn from disposition.  The loquacious man is at times silent; one who is taciturn may now and then make an effort at conversation.
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  taciturn
       adj : habitually reserved and uncommunicative [ant: voluble]