The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   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.
      [1913 Webster]

            The harsh and bitter feelings of this or that
            experience are slowly obliterated.    --W. Black.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

obliterating \obliterating\ adj.
   making undecipherable or imperceptible; as, obliterating
   mists.

   Syn: obscurant.
        [WordNet 1.5]