I did something stupendous at school
I'm not sure exactly but you can use it as : That man has superhuman strength. Something beyond what a normal person can do.
The fireworks display on the Fourth of July was truly stupendous, lighting up the night sky with vibrant colors and loud bangs.
Stupendous
I have civil rights because i am a USA citezen.
more stupendous, most stupendous
Stupendous has three syllables.
Because it would be stupendous if it wasn't so humble.
That's awesome, stupendous, magnificent, tremendous,...
I would use it correctly in a sentence, of course. Thank you for asking.
Jarry use paroxysm in a sentence.\
I would use the word "theory" in a sentence like this: "The scientist presented a new theory to explain the findings of the experiment."