Of the nature of a prodigy; marvelous; wonderful; portentous.

of momentous or ominous significance; "such a portentous...monster raised all my curiosity"- Herman Melville; "a prodigious vision"

Extraordinary in bulk, extent, quantity, or degree; very great; vast; huge; immense; as, a prodigious mountain; a prodigious creature; a prodigious blunder.

great in quantity

great in size

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's prodigious talents"