underbreath

Etymology

From under- + breath.

adj

  1. Vocalized under one's breath.“Aleck gave a low, underbreath whistle.”

adv

  1. Under one's breath; inaudibly or in a barely audible manner.“Muttering curses underbreath, he jabs the beast sharply with his training stick ; the elephant is hairy and it, like the clown, is ignoble.”

noun

  1. An utterance made so as not to be heard by most people in the area.“The underbreath of our every prayer should be, “Father, not my will, but thine be done””