Big-voiced is typically used to describe someone with a loud or powerful voice. However, there are several synonyms that can be used to convey the same meaning, such as thunderous, booming, resonant, sonorous, or stentorian. Each of these words can describe a strong and impactful voice, either through volume or tone. Some other similar words may include commanding, authoritative, assertive, or impressive. These words can be used to describe someone with a powerful and confident voice that demands attention. Whether it's in public speaking, singing, or simply commanding a room, having a big-voiced individual around can be a force to be reckoned with.