Source : Webster's Revised Unabridged Dictionary (1913)

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

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

   2. Foul; fifthy; disgusting.

Source : WordNet®

obscene
     adj 1: designed to incite to indecency or lust; "the dance often
            becomes flagrantly obscene"- Margaret Mead
     2: offensive to the mind; "an abhorrent deed"; "the obscene
        massacre at Wounded Knee"; "morally repugnant customs";
        "repulsive behavior"; "the most repulsive character in
        recent novels" [syn: {abhorrent}, {detestable}, {repugnant},
         {repulsive}]
     3: suggestive of or tending to moral looseness; "lewd
        whisperings of a dirty old man"; "an indecent gesture";
        "obscene telephone calls"; "salacious limericks" [syn: {lewd},
         {raunchy}, {salacious}]