also: まゆひとつうごかさぬ
expression, i-adjective
unfazed; stone-faced; unflinching
Describes someone who remains completely calm and shows no emotional reaction, as if not even moving an eyebrow. Often used in situations where a normal person would be surprised or upset.
彼は大勢の前で批判されても眉一つ動かさなかった。
He didn't bat an eye even when criticized in front of a large crowd.
その
Even hearing that news, she remains perfectly calm.