adjective Also low-keyed.
verb (used with object), low-keyed, low-key·ing.
Origin of low-key
Examples from the Web for low-key
Later that night, this low-key man went out on stage with otherworldly energy.
In person, Ligety is fairly humble, and low-key—almost enigmatic.The Can't-Miss Sochi Showdown: Bode Miller And Ted Ligety|Jake Bright|February 9, 2014|DAILY BEAST
This is where having a low-key character like Deborah Samson, rather than, say, George Washington, was really helpful.The Cross-Dressing Revolutionary: Alex Myers’ New Novel|Eric Herschthal|February 4, 2014|DAILY BEAST
Instead, the star will celebrate tonight with a low-key dinner at home.Justin Bieber Faces Deportation; NBC Moves Emmy Awards to Monday|Culture Team|January 29, 2014|DAILY BEAST
Besides, her position dictated a discreet, low-key approach.
She dressed well, and low-key, and you could tell how smart she was just by looking at her.Little Brother|Cory Doctorow