under your breath

Related
  • whisperSpeech without full voice
  • murmurSoft, indistinct continuous sound
  • mutterSpeak low and indistinctly
  • mumbleSpeak softly, indistinctly
  • hushAbsence of sound

quiet · soft · inaudible · secret · hushed · low · voice · barely · faint · undertone · aside · grumble · curse · prayer · sigh · lips · throat · subtle

Opposites
volume/audibility

under your breathat the top of your lungs

out loud · loudly · aloud · shouting · yelling

openness/concealment

under your breathopenly

Without hiding anything

publicly · out in the open · in public · on the record · brazenly

Familiarity
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