Yes, and I managed to do very well in the subject.
I guess Merriam and Webster don't know the meaning, either.
Please enlighten me. Other than the out of using it as a proper name, please enlighten me as to how "simple" is a noun. Even in the poem "Simple Simon" simple was used to describe Simon, in other words, an adjective.
You have got to be kidding. Without even looking, even Merriam Webster (that I do not use) must recognize “simple” as a noun. Why don’t you quit while you’re behind?