Meaning : So great in size or force or extent as to elicit awe.
Example :
Colossal crumbling ruins of an ancient temple.
Has a colossal nerve.
A prodigious storm.
A stupendous field of grass.
Stupendous demand.
Synonyms : colossal, stupendous
Meaning : Of momentous or ominous significance.
Example :
Such a portentous...monster raised all my curiosity.
A prodigious vision.
Synonyms : portentous
Meaning : Far beyond what is usual in magnitude or degree.
Example :
A night of exceeding darkness.
An exceptional memory.
Olympian efforts to save the city from bankruptcy.
The young Mozart's prodigious talents.
Synonyms : exceeding, exceptional, olympian, surpassing