
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

So INSECURE.
The Big Bang Theory Season 5, Episode 13

You know, I've always been INSECURE
The Big Bang Theory Season 9, Episode 12

...that makes you a little INSECURE.
The Big Bang Theory Season 8, Episode 6