tremendous

Awe-inspiring; terrific.

This she spoke with so commanding an air, standing with her back to the fire, with one hand behind her, and a pinch of snuff in the other, that I question whether Thalestris, at the head of her Amazons, ever made a more tremendous figure.

Notable for its size, power, or excellence.

Van Beethoven's ninth symphony is a tremendous piece of music.

Extremely large (in amount, extent, degree, etc.) or great

There was a tremendous outpouring of support.

The tremendous tragedy in which he had been involved - it was evident he was a fugitive from Weybridge - had driven him to the very verge of his reason.