B747-437B From , joined Dec 1969, posts, RR: Reply 5, posted (9 years 2 months 1 week 1 day 18 hours ago) and read 1317 times:
"Stupider" is incorrect grammar.
stu·pid ( P ) Pronunciation Key (stpd, sty-)
adj. stu·pid·er, stu·pid·est
Slow to learn or understand; obtuse.
Tending to make poor decisions or careless mistakes.
Marked by a lack of intelligence or care; foolish or careless: a stupid mistake.
Dazed, stunned, or stupefied.
Pointless; worthless: a stupid job.