Something exceptional, substantial, or great is prodigious. A blizzard includes prodigious wind and snow. A prodigious writer is one who can write a lot and do it well.

Prodigious is a word for things that are impressive. If you have prodigious strength, you're very strong. If your cat had a prodigious litter of kittens, then you've got a houseful of kittens. This is a strong word that's also kind of formal. Save it for things that really blow you away because of their quality or quantity. A little drizzle isn't a prodigious rain, but a storm that floods a whole city certainly is.

Definitions of prodigious

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

“a prodigious storm”
colossal, stupendous
big, large
above average in size or number or quantity or magnitude or extent

adj far beyond what is usual in magnitude or degree

“the young Mozart's prodigious talents”
exceeding, exceptional, olympian, surpassing
beyond what is ordinary or usual; highly unusual or exceptional or remarkable

adj of momentous or ominous significance

“a prodigious vision”
important, significant
important in effect or meaning

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