They're probably looking for false, but to be honest, I use it in my writing sometimes. It depends on the setting and character, or it should be specified as slang in nonfiction writing.
He is a simp who is now broke
I have no idea is the correct answer
This paper is alive with sympathetic insight into Shakespeare (if you mean a sentence with the word insight) theres more in merriam webster dictionary. it gives you more example sentences
i-n-s-i-g-h-t (literally spelling insight)
