The Collaborative International Dictionary of English v.0.48:

Scurrilous \Scur"ril*ous\, a. [See Scurrile.]
   1. Using the low and indecent language of the meaner sort of
      people, or such as only the license of buffoons can
      warrant; as, a scurrilous fellow.
      [1913 Webster]

   2. Containing low indecency or abuse; mean; foul; vile;
      obscenely jocular; as, scurrilous language.
      [1913 Webster]

            The absurd and scurrilous sermon which had very
            unwisely been honored with impeachment. --Macaulay.
      [1913 Webster]

   Syn: Opprobrious; abusive; reproachful; insulting; insolent;
        offensive; gross; vile; vulgar; low; foul; foul-mouthed;
        indecent; scurrile; mean.
        [1913 Webster] -- Scur"ril*ous*ly, adv. --
        Scur"ril*ous*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

scurrilous
    adj 1: expressing offensive reproach [syn: abusive,
           opprobrious, scurrilous]