这家buttoned-down银行的着装要求非常严格，不允许任何休闲服饰。

This ___buttoned-down bank has a strict dress code that doesn't allow any casual wear.

他在会议上表现得非常克制，几乎从不表露真实想法。

He maintained a ___buttoned-down attitude during the meeting, rarely showing his true thoughts.