different between speechlessly vs inaudibly

English

speechless +? -ly

speechlessly (comparative more speechlessly, superlative most speechlessly)

In a speechless manner; without speaking.
He stood there speechlessly. The surprise had rendered him unable to make an intelligible reply.

inaudible +? -ly

inaudibly (not comparable)

In a manner which is incapable of being heard or not loud enough to be heard.
The cat scampered inaudibly across the floor.

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