thun·der·ous /ˈθʌnd(ə)rəs/
  (a.)將要打雷的,象打雷的
  Thun·der·ous a.
  1. Producing thunder. [R.]
     How he before the thunderous throne doth lie.   --Milton.
  2. Making a noise like thunder; sounding loud and deep; sonorous.
  -- Thun*der*ous*ly, adv.
  ◄ ►
  thunderous
       adj 1: loud enough to cause (temporary) hearing loss [syn: deafening,
               earsplitting, roaring, thundery]
       2: extremely ominous; "world events of thunderous import"