The term "soft-voiced" refers to someone who speaks in a gentle, mild, and tender tone that is soothing to listen to. However, there are many other synonyms that can be used to describe such a person. Words like low-toned, hushed, whispered, gentle-spoken, and muffled can be used interchangeably with soft-voiced. Other synonyms include dulcet, mellifluous, mellow, and sweet-toned, which describe a voice that is pleasing to hear. So, whether you want to describe a person's communication style or admire their soothing voice, there are plenty of synonyms to choose from that will help you express yourself more eloquently.