sibilantly

/ˈsɪbɪləntli/
adverb
  1. In a way that makes a soft hissing sound.
    • Steam escaped sibilantly from the kettle's spout.
    • She whispered sibilantly, so that only the person next to her could hear.
    • The snake moved sibilantly through the dry leaves.
Synonyms
What does "sibilantly" mean? | whatsthatwordmean | whatsthatwordmean