Source : Webster's Revised Unabridged Dictionary (1913)

Obliterate \Ob*lit"er*ate\, v. t. [imp. & p. p. {Obliterated};
   p. pr. & vb. n. {Obliterating}.] [L. obliteratus, p. p. of
   obliterare to obliterate; ob (see {Ob-}) + litera, littera,
   letter. See {Letter}.]
   1. To erase or blot out; to efface; to render undecipherable,
      as a writing.

   2. To wear out; to remove or destroy utterly by any means; to
      render imperceptible; as. to obliterate ideas; to
      obliterate the monuments of antiquity.

            The harsh and bitter feelings of this or that
            experience are slowly obliterated.    --W. Black.

Source : WordNet®

obliterating
     adj : making undecipherable or imperceptible; "obliterating
           mists"; "an obscurant bank of clouds" [syn: {obscurant}]