low-key , also: low-keyed , also: lowkey

"She is low key and does not make a show of herself."

There are still some but it's a little more low key.

Moving from a lower key to a higher often indicates an increase in energy.

I want to keep it low key for a few weeks - until I'm out of the danger period.

He is low key about his place in the ballet world.

Since he seems to have been low key, not taking part in any bands at the moment.

Racing continued in the 1900s although on a low key.

The level of bidding and play is said to be low key.

I wanted something a little more low key for my first talk show.

He is low key and in many ways the opposite of the Prior.