[ adv ] in an inaudible manner <adv.all> she spoke inaudibly low
Inaudible \In*au"di*ble\, a. [L. inaudibilis; pref. in- not + audire to hear: cf. F. unaudible. See {In-} not, and {Audible}.] Not audible; incapable of being heard; silent. -- {In*au"di*ble*ness}, n. -- {In*au"di*bly}, adv.
Mindful of the confrontation, most committee members mumbled inaudibly when the House roll was called.