忍しのび声ごえ

noun

whispering; hushed voice

A low, quiet voice used to avoid being overheard; often associated with stealth or secrecy.

• 二人ふたりは忍しのび声ごえで話はなし合あった。

  The two talked in hushed voices.

• 忍しのび声ごえが聞きこえたので、誰だれかいると思おもった。

  I heard whispering, so I thought someone was there.