knave /ˈnev/
  惡棍,騙徒,紙牌的傑克
  Knave n.
  1. A boy; especially, a boy servant. [Obs.]
  O murderous slumber,
  Lay'st thou thy leaden mace upon my boy
  That plays thee music ? Gentle knave, good night.   --Shak.
  2. Any male servant; a menial. [Obs.]
  He's but Fortune's knave,
  A minister of her will.   --Shak.
  3. A tricky, deceitful fellow; a dishonest person; a rogue; a villain. “A pair of crafty knaves.”
     In defiance of demonstration, knaves will continue to proselyte fools.   --Ames.
  Note: ☞ “How many serving lads must have been unfaithful and dishonest before knave -- which meant at first no more than boy -- acquired the meaning which it has now !”
  4. A playing card marked with the figure of a servant or soldier; a jack; as, the knave of hearts.
  Knave child, a male child. [Obs.]
  Syn: -- Villain; cheat; rascal; rogue; scoundrel; miscreant.
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  knave
       n 1: a deceitful and unreliable scoundrel [syn: rogue, rascal,
             rapscallion, scalawag, scallywag, varlet]
       2: one of four face cards in a deck bearing a picture of a
          young prince [syn: jack]