Meanings
humorousgreatly, totally, immensely; used with erstaunt (“astonished”) or, less often, other words expressing a sudden reaction/emotion
Ich war bass erstaunt.I was totally astonished.
archaicbetter, more properly, readily
1 more meanings
Adjective
raregreat, total, immense; with nouns expressing astonishment etc. (as above)
basses Erstaunenstark astonishment