When it comes to describing loud sounds, there are plenty of synonyms to choose from. Some alternatives to "loud-sounding" include booming, sonorous, deafening, thunderous, clamorous, ear-splitting, resounding, raucous, and vociferous. Each of these words conveys a slightly different nuance of sound, ranging from deep and powerful to sharp and piercing. For example, "booming" might describe the rumble of thunder, while "ear-splitting" could be used to describe a high-pitched scream. By choosing the right synonym, you can help your writing be more precise and engaging, painting a more vivid picture of the soundscape around you.