Astonishing \As*ton"ish*ing\, a. Very wonderful; of a nature to excite astonishment; as, an astonishing event. [1913 Webster] Syn: Amazing; surprising; wonderful; marvelous. [1913 Webster] {As*ton"ish*ing*ly}, adv. -- {As*ton"ish*ing*ness}, n. [1913 Webster]