uncharacteristically

adverb3 コロケーション平均頻度: 5.1

柄にもなく静か

being less talkative or noisy than is usual for the person.

いつもより口数が少なかったり、物静かであること。

not speaking when it is unusual for the person to be so.

behaving in a shy or reserved way that is not typical for the person.