IPA: /stəˈpɛndəsli/
KK: /stəˈpɛndəsli/
In a way that is extremely impressive or amazing.
The magician performed stupendously, leaving the audience in awe.
Stupendously → It is formed from "stupendus" (from Latin, meaning to be amazed or astonished) and the suffix "-ly" (meaning in a manner of). The word "stupendously" means in a manner that causes amazement or astonishment.
Think of being 'amazed' ('stupendus') and how the '-ly' makes it describe the way something happens. This helps you remember that 'stupendously' means something happens in an amazing way.