Source : Webster's Revised Unabridged Dictionary (1913)

Thunder \Thun"der\, v. i. [imp. & p. p. {Thundered}; p. pr. &
   vb. n. {Thundering}.] [AS. [thorn]unrian. See {Thunder}, n.]
   1. To produce thunder; to sound, rattle, or roar, as a
      discharge of atmospheric electricity; -- often used
      impersonally; as, it thundered continuously.

            Canst thou thunder with a voice like him? --Job xl.
                                                  9.

   2. Fig.: To make a loud noise; esp. a heavy sound, of some
      continuance.

            His dreadful voice no more Would thunder in my ears.
                                                  --Milton.

   3. To utter violent denunciation.

Thundering \Thun"der*ing\, a.
   1. Emitting thunder.

            Roll the thundering chariot o'er the ground. --J.
                                                  Trumbull.

   2. Very great; -- often adverbially. [Slang] --
      {Thun"der*ing*ly}, adv.

Thundering \Thun"der*ing\, n.
   Thunder. --Rev. iv. 5.

Source : WordNet®

thundering
     adj 1: sounding like thunder; "the thundering herd"
     2: extraordinarily big or impressive; "a thundering success";
        "the thundering silence of what was left unsaid"