Secret-keeping is a complicated endeavor.
One has to be CONCERNED...
The Big Bang Theory Season 2, Episode 1
On the other hand, some physicists are
CONCERNED that if this supercollider works...
The Big Bang Theory Season 1, Episode 15
I’m very CONCERNED about my pupil, Silvia.
Money Heist Season 1, Episode 8
Should I be CONCERNED?
Game of Thrones Season 4, Episode 3
I'm a little CONCERNED.
The Big Bang Theory Season 6, Episode 4