adverb
inaudibly
adverb
1
In a way that cannot be heard, or is too quiet to hear clearly.
"She muttered something inaudibly under her breath."
How to Use Inaudibly
Learner’s notesIn plain EnglishSo quietly that no one can make out what's being said.
Word Forms
more inaudibly comparative, most inaudibly superlative
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She muttered something _____ under her breath.
Etymology
From inaudible plus the adverb-forming suffix -ly.