inaudibly

Adverb

Meaning

in an inaudible manner

Source: WordNet

silently soundlessly quietly weakly softly faintly indistinct invisibly indistinctly mutely stilly hazily dumbly impalpably sotto voce

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audibly loudly exactly clearly spoken distinctly

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inaudible

she spoke inaudibly low Source: Internet

I asked myself inaudibly, “Why he didn’t join the conversation?” Source: Internet

Without hesitation, but almost inaudibly, Harvey replied, “Yes.” Source: Internet

inaudibility inaudible inaudibleness inaugur inaugural inaugural address