in an undertone

In a subtle, low-key, or hushed manner; quietly or understatedly. Usually but not always used in reference to speech or sound. I heard him state in an undertone that he wasn't surprised at the poor reception, given management's inadequate budget for the project, but I don't think anyone else heard him. In an undertone, the film upends the cliché of violence as a means of resolution that is so often the focus of other action films. Sir, I knew my question would create controversy, that's why I tried to ask it in an undertone during the break.

in an ˈundertone

in ˈundertones

in a quiet voice: ‘I must leave now,’ he said in an undertone. OPPOSITE: at the top of your voice