From a purely environmental standpoint, the statistics in favor of Tetra Pak packaging are astounding.
To me it is astounding that Philomena still has her strong religious belief even after everything that was done to her.
And you have an astounding 180 acting credits on your resume.
mid-15c., from Middle English astouned, astoned (c.1300), past participle of astonen, astonien "to stun" (see astonish), with more of the original sense of Vulgar Latin *extonare. Related: Astounded; astounding.