It can be used in a neutral way to describe someone's voice, or it can have slightly negative connotations, implying that the voice is weak or lacking in power.
Here are some possible interpretations of "tonu koe" in English:
* A soft, delicate voice: This is a neutral interpretation, focusing on the gentle nature of the voice.
* A faint, whispery voice: This emphasizes the quietness and potential difficulty in hearing the voice.
* A weak, unconvincing voice: This interpretation suggests that the voice lacks strength or authority.
The specific meaning of "tonu koe" will depend on the context in which it is used.