UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌləʊˈkiː/US:USA pronunciation: respellingUSA pronunciation: respelling(lō)

WordReference Random House Learner's Dictionary of American English © 2020
ˈlow-ˈkey or  ˈlow-ˈkeyed,  adj. 
  1. of reduced strength, amount, power, or intensity;
    restrained:a low-key reception.

WordReference Random House Unabridged Dictionary of American English © 2020
low-key  (lō),USA pronunciation adj., v.,  -keyed, -key•ing. 
adj. Also,  low-keyed. 
  1. of reduced intensity;
  2. Photography(of a photograph) having chiefly dark tones, usually with little tonal contrast (distinguished from high-key).

  1. to make or attempt to make low-key:to low-key the arms buildup.
  • 1890–95

Collins Concise English Dictionary © HarperCollins Publishers::
low-key, low-keyed adj
  1. having a low intensity or tone
  2. restrained, subdued, or understated
  3. (of a photograph, painting, etc) having a predominance of dark grey tones or dark colours with few highlights
    Compare high-key
'low-key' also found in these entries (note: many are not synonyms or translations):

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