rib·ald /ˈrɪbəld ||ˈrɪˌbɔld, ˈraɪˌbɔld/
  (a.)說話猥褻的,下流的,卑賤的說下流話的人
  Rib·ald n.  A low, vulgar, brutal, foul-mouthed wretch; a lewd fellow.
     Ribald was almost a class name in the feudal system . . . He was his patron's parasite, bulldog, and tool . . . It is not to be wondered at that the word rapidly became a synonym for everything ruffianly and brutal.   --Earle.
  Rib·ald, a. Low; base; mean; filthy; obscene.
  The busy day,
  Waked by the lark, hath roused the ribald crows.   --Shak.
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  ribald
       adj : humorously vulgar; "bawdy songs"; "off-color jokes"; "ribald
             language" [syn: bawdy, off-color]
       n : a ribald person; someone who uses vulgar and offensive
           language