Quote: reffy "Stupid - adjective
Stupider - comparative form of 'stupid' - alternative 'more stupid'
Stupidest - superlative form of 'stupid - alternative 'most stupid''"
Try running stupider & stupidest by an English teacher reffy ....
Chances are that they are defined in the dictionary as modern adjectives, yet frowned upon in literary terms.
What is certain is that neither sound stupendous.