
Okay, this is SILLY.
The Big Bang Theory Season 11, Episode 11

You're gonna feel pretty SILLY
when we're 80 years old,
The Big Bang Theory Season 7, Episode 14

Sheldon, don't be SILLY.
The Big Bang Theory Season 9, Episode 24

Well, anything can sound SILLY
when you put it in that tone.
The Big Bang Theory Season 10, Episode 5

because of some
SILLY Roommate Agreement.
The Big Bang Theory Season 5, Episode 15