soundlessly
Adverb
Meaning
without a sound
Source: WordNetSynonyms
noiselessly
silent
quietly
silently
calmly
softly
faintly
mutely
stilly
dumbly
implicitly
inaudibly
statically
tacitly
wordlessly
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Antonyms
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Examples
You're my sister,” he said finally. "My sister, my blood, my family. I should want to protect you”-he laughed soundlessly and without any humor-"to protect you from the sort of boys who want to do with you exactly what I want to do.
Overall, the library held a hushed exultation, as though the cherished volumes were all singing soundlessly within their covers.
he stood up soundlessly and speechlessly and glided across the hallway and through a door