Definition of "low-key" in English

adjective

1. (art, photography) Dark; characterized by dark tones and muted colors.

2. (by extension) Restrained, subtle, not trying to attract attention.

   • She deserves an Oscar for her low-key performance in that movie.

adverb

1. (chiefly Canada, US, colloquial) Kind of.

2. (slang) In a low-key or surreptitious manner; secretively; understatedly; on the down-low.