What does "speechlessly" mean?

In a speechless manner; without speaking.

What is a synonym for "speechlessly"?

Common synonyms include: dumbly, no speech capability.

adv

adv ·Rare ·Advanced level

Adverb

1
In a speechless manner; without speaking.
"He stood there speechlessly. The surprise had rendered him unable to make an intelligible reply."

Adverb

1
in a manner indicating that one is deprived of speech by physical weakness or emotion wordnet

"Tom and Mary looked at each other speechlessly."

From speechless + -ly.