
Look, Sheldon, sweetie,
I know you're feeling INSECURE...
The Big Bang Theory Season 3, Episode 13

but whenever you're between projects
you tend to get a little INSECURE.
The Big Bang Theory Season 10, Episode 23

I can't believe
Leonard would be so INSECURE.
The Big Bang Theory Season 10, Episode 22

But when you're INSECURE,
The Big Bang Theory Season 10, Episode 19

...who felt so INSECURE, that she lied to him
about finishing community college.
The Big Bang Theory Season 2, Episode 1