Staggering
Part of speech: adjective
Definition: Incredible, overwhelming, amazing.
Part of speech: verb
Definition: Sway unsteadily, reel, or totter.
Example sentence: People do not realize that Alzheimer's is not old age. It is a progressive and fatal disease and staggering amounts of people develop Alzheimer's every day.
Astonishing
Part of speech: verb
Definition: To surprise greatly.
Example sentence: First of all, there was a volcano of words, an eruption of words that Shakespeare had never used before that had never been used in the English language before. It's astonishing. It pours out of him.