That's low-key.
That's low-key.
That's low-key" means something is subtle, not very intense, or deliberately toned down. It’s often used to describe a casual attitude or something done without aiming for attention.
He's low-key one of the best artists around.
The speaker notes someone is quietly one of the best artists around without much recognition.
She's into low-key weekends, just chilling at home.
The speaker describes how someone enjoys relaxing, uneventful weekends.
I actually prefer keeping things low-key, especially when it comes to personal matters.
The speaker prefers keeping things quiet and simple, especially regarding personal matters.