They overtly opposed the proposal during the meeting.

overtly 是副词，由形容词 overt（公开的、明显的）加上后缀 -ly 构成。overt 来自拉丁语 apertus，意思是"打开的、公开的"。 overtly 表示"公开地、明显地"，强调行为或态度是毫不掩饰地表现出来的。