\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.

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