pol·troon /pɑlˈtrun/
  懦夫,膽小鬼(a.)膽怯的
  Pol·troon n.  An arrant coward; a dastard; a craven; a mean-spirited wretch.
  Pol·troon, a. Base; vile; contemptible; cowardly.
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  poltroon
       adj : characterized by complete cowardliness
       n : an abject coward [syn: craven, recreant]