stupendous

So great in scope, degree, or importance as to amaze.

Extremely large in amount, extent, or size; enormous.

Remarkable; outstanding.

Causing stupor or astonishment; astounding; amazing; specifically, astonishing from greatness in extent or degree; of wonderful magnitude; immense; prodigious: as, a stupendous work of nature or art; a stupendous blunder.

Astonishing; wonderful; amazing; especially, astonishing in magnitude or elevation.

Astonishingly great or large; huge; enormous.

Of stunning volume, degree, or excellence; marvelous.

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