Definition of low-key adjective from the Oxford Advanced Learner's Dictionary

 

low-key

 adjective
adjective
BrE
 
; NAmE
 
 
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not intended to attract a lot of attention Their wedding was a very low-key affair.Extra examples We have a fairly low-key approach to discipline. We want to keep the whole affair as low-key as possible. The announcement was relatively low-key. The wedding was a low-key affair, with just family and close friends.
See the Oxford Advanced American Dictionary entry: low-key