informal: in a way or to a degree that is moderate or limited
It didn't take long for all of us to become low-key[=somewhat] obsessed with Lizzo … Abi Travis
Everywhere we go, we're low-key[=casually] checking out coffee shops, parks, and window seats for maximum reading coziness. Charlotte Ahlin
We asked the BuzzFeed Community to tell us which products have low-key changed their lives. Samantha Wieder
First things first: for what it's worth, I low-key think Jake Gyllenhaal is the best actor of his generation. Eric Ital
2
informal: without seeking or receiving much attention or recognition
Nordstrom low-key announced the sale with little fanfare … Danielle Gonzalez
The 21-year-old model and 24-year-old musician surprised everyone when they low-key stepped into a New York City courthouse to make it official … Jamie Leelo
… is low-key getting some of the best and most underrated lines in these episodes … Kase Wickman
She was low-key the best player on that season … Leigh Oleszczak