low-key
adjective uk/ˌləʊˈkiː/ us/ˌloʊˈkiː/
（活动）低调的，不张扬的
A low-key event is quiet and without a great show of excitement.
The wedding was a low-key affair, with fewer than 30 people attending. 婚礼办得很低调，参加者不足30人。
Synonym: subdued
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