The Collaborative International Dictionary of English v.0.48:

Obscene \Ob*scene"\, a. [L. obscenus, obscaenus, obscoenus, ill
   looking, filthy, obscene: cf. F. obsc['e]ne.]
   [1913 Webster]
   1. Offensive to chastity or modesty; expressing or presenting
      to the mind or view something which delicacy, purity, and
      decency forbid to be exposed; impure; as, obscene
      language; obscene pictures.
      [1913 Webster]

            Words that were once chaste, by frequent use grew
            obscene and uncleanly.                --I. Watts.
      [1913 Webster]

   2. Foul; fifthy; disgusting.
      [1913 Webster]

            A girdle foul with grease binds his obscene attire.
                                                  --Dryden
                                                  (Aeneid, vi.
                                                  417).
      [1913 Webster]

   3. Inauspicious; ill-omened. [R.] [A Latinism]
      [1913 Webster]

            At the cheerful light,
            The groaning ghosts and birds obscene take flight.
                                                  --Dryden.
      [1913 Webster]

   Syn: Impure; immodest; indecent; unchaste; lewd.
        [1913 Webster] -- Ob*scene"ly, adv. --
        Ob*scene"ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

obscenely
    adv 1: to an obscene degree; "this man is obscenely rich"
    2: in a lewd and obscene manner; "he had seen how in their
       dances the white men and women held one another obscenely"
       [syn: lewdly, obscenely]