That's a bit Childish, isn't it?
The Big Bang Theory Season 10, Episode 11
Guys, you're
being CHILDISH.
The Big Bang Theory Season 7, Episode 16
Do you know how CHILDISH you sound
right now?
The Big Bang Theory Season 3, Episode 7
Don't make it sound CHILDISH.
The Big Bang Theory Season 12, Episode 14
It's a CHILDISH trick designed to confuse
and intrigue simpletons.
The Big Bang Theory Season 4, Episode 18