Definitions from Wiktionary (low-key)

▸ adjective:  (art, photography) Dark; characterized by dark tones and muted colors.
▸ adjective:  (by extension) Restrained, subtle, not trying to attract attention.
▸ adverb:  (chiefly Canada, US, colloquial) Kind of.
▸ adverb:  (slang) In a low-key or surreptitious manner; secretively; understatedly; on the down-low.
▸ Also see low-key


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