However, here are some options that attempt to capture the essence of soft speech:
* Whispering: This is the most common way to represent soft speech, with sounds like "shh," "hush," or "whisper".
* Muttering: This suggests a low and unclear voice, perhaps with sounds like "mumble," "murmur," or "grumble".
* Hushing: This emphasizes a quiet and calming tone, with sounds like "hush," "soothing," or "calmly".
Ultimately, the best onomatopoeia for "talk softly" depends on the specific context and the desired effect.