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Adjective: thunderous  thún-du-rus
  1. Loud enough to cause (temporary) hearing loss
    "A loud, one-note wail, long and thunderous, sounded from outside";
    - deafening, earsplitting, thundery
     
  2. Extremely ominous
    "world events of thunderous import"

See also: loud, unpropitious

Encyclopedia: Thunderous