User blog comment:Gumball2/Is Leni Really Stupid?/@comment-1650307-20171003035025

"Stupid", no. "Dumb", yes.

I think that the term "stupid" to describe Leni is in correct because IMO, she can live and eat and breathe and behave like a normal human, she just lacks intelligence to do more "complex" things like remembering names or numbers. Therefore, I think she is more "dumb". Certainly she lacks intelligence and has trouble with aspects of everyday life, but at least she knows how to breathe and eat and sleep.