jaw-dropping, sensational, dumfounding, stupendous, flabbergasting, stupefying, awful, fantastic, dumbfounding, wondrous, awe-inspiring, staggering, awing, blindsiding, unbelievable, marvelous, portentous, wonderful, remarkable, good, sublime, incredible, earth-shattering, awesome, jarring, eye-opening, miraculous, phenomenal, fantastical, fabulous, prodigious
amazing (part of speech: verb)
wondering (part of speech: verb)
surprising (part of speech: verb)
- Here Mr. Pidgen, in the most astonishing way, was suddenly in a terrible temper. - "The Golden Scarecrow", Hugh Walpole.
- It was all the more astonishing because it had come so suddenly, and Barbara could hardly tear mademoiselle away from the spot until she suggested that those at home might not have heard of it yet, and that she might be the first to tell it to them. - "Barbara in Brittany", E. A. Gillie.
- He tells the most astonishing things. - "The Diamond Pin", Carolyn Wells.