prodigious

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

• “colossal crumbling ruins of an ancient temple”
• “has a colossal nerve”
• “a prodigious storm”
• “a stupendous field of grass”
• “stupendous demand”

of momentous or ominous significance

• “such a portentous...monster raised all my curiosity” Herman Melville
• “a prodigious vision”

far beyond what is usual in magnitude or degree

• “a night of exceeding darkness”
• “an exceptional memory”
• “olympian efforts to save the city from bankruptcy”
• “the young Mozart”