Source : Webster's Revised Unabridged Dictionary (1913)

Annihilate \An*ni"hi*late\, v. t. [imp. & p. p. {Annihilated};
   p. pr. & vb. n. {Annihilating}.] [L. annihilare; ad +
   nihilum, nihil, nothing, ne hilum (filum) not a thread,
   nothing at all. Cf. {File}, a row.]
   1. To reduce to nothing or nonexistence; to destroy the
      existence of; to cause to cease to be.

            It impossible for any body to be utterly
            annihilated.                          --Bacon.

   2. To destroy the form or peculiar distinctive properties of,
      so that the specific thing no longer exists; as, to
      annihilate a forest by cutting down the trees. ``To
      annihilate the army.'' --Macaulay.

   3. To destroy or eradicate, as a property or attribute of a
      thing; to make of no effect; to destroy the force, etc.,
      of; as, to annihilate an argument, law, rights, goodness.

Source : WordNet®

annihilating
     adj 1: wreaking or capable of wreaking complete destruction;
            "possessing annihilative power"; "a devastating
            hurricane"; "the guns opened a withering fire" [syn: {annihilative},
             {devastating}, {withering}]
     2: making light of; "afire with annihilating invective"; "a
        devastating portrait of human folly"; "to compliments
        inflated I've a withering reply"- W.S.Gilbert [syn: {devastating},
         {withering}]