Prodigious

1. adjective

   of momentous or ominous significance; - Herman Melville

   “such a portentous...monster raised all my curiosity”

   Similar: portentous

2. adjective

   so great in size or force or extent as to elicit awe

   “colossal crumbling ruins of an ancient temple”

   Similar: colossal, stupendous

3. adjective

   far beyond what is usual in magnitude or degree

   “a night of exceeding darkness”

   Similar: exceeding, exceptional, olympian, surpassing