Open English Wordnet
Adjectives
(s)astonishing, astounding, staggering, stupefyingso surprisingly impressive as to stun or overwhelm“such an enormous response was astonishing”, “an astounding achievement”, “the amount of money required was staggering”, “suffered a staggering defeat”, “the figure inside the boucle dress was stupefying”
(s)stupefyingmaking physically stupid or dull or insensible“a stupefying blow to the head”, “the stupefying effects of hemp”