IPA: /stjuːˈpɛndəs/
KK: /stjuːˈpɛndəs/
Extremely impressive or amazing in size, quality, or degree.
The fireworks display was stupendous, lighting up the entire sky.
Comparative: more stupendous
Superlative: most stupendous
Stupendous → It is formed from "stupere" (meaning to be stunned or amazed) and the suffix "-dous" (indicating having the quality of). The word "stupendous" describes something that has the quality of causing amazement or astonishment.
Think of being 'stunned' ('stupere') by something that is truly remarkable or amazing — that's what makes something stupendous.
No commonly confused words.