downbeat
adjective informal uk/ˈdaʊn.biːt/ us/ˈdaʊn.biːt/
低调的，不张扬的
quiet and without much excitement
The actual signing of the treaty was a downbeat affair without any ceremony. 条约的签署很低调，并没有举行任何仪式。
I thought he'd be really excited, but he seemed kind of downbeat. 我以为他会非常激动，可他看起来却平静低调。
Compare: upbeat