Quiet as a mouse is a common phrase used to describe someone or something that is very quiet. However, there are several other synonyms which could be used to replace this phrase such as silent as the night, as quiet as death, still as a stone, noiseless as a cat, hushed as a whisper, soft as a feather and so on. Each of these phrases describes a sense of calm and stillness, urging us to keep quiet and maintain a sense of tranquility. Using these synonyms can be useful when you need to describe quietness in a creative way without using the same phrase again and again.