subversive
  (a.)從事顛覆的,破壞性的破壞分子,危險分子
  Sub·ver·sive a.  Tending to subvert; having a tendency to overthrow and ruin.
     Lying is a vice subversive of the very ends and design of conversation.   --Rogers.
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  subversive
       adj : in opposition to a civil authority or government [syn: insurgent,
              seditious]
       n : a radical supporter of political or social revolution [syn:
           revolutionist, revolutionary, subverter]