is stupid a bad word?

I suppose it is, if you're five.

Honey, there are words a lot worse than stupid that most of us use all the time, you'll learn that when u get older.

ehh Because your cousin is little kid.lol Stupid is not a bad word i say it all the time...

Do pigs fly?

It's never nice to insult people. But your cousin, who is in your words little, has been taught that every insulting word is bad. So, あなた should go with her answer and never insult people. ;]

It's not really a bad word,but it's a ruder way of saying "dumb". My parents and my elders consider it a bad word though...my grandmother hates that word (stupid)

It's a bad word to some people. It doesn't really bother others. I guess it just depends on what that certain person thinks.

If you're asking if its a curse, than no. But it is a word to be used in a negative way.

the 3 年 old I babysit asked the same thing the other day

well yes
but not if あなた were older

no

How old are you?