* 静か (shizuka): This is the most common and general word for "tranquil" or "quiet." It describes a state of peace and stillness.
* 穏やか (odayaka): This word implies a gentle and calm atmosphere, often associated with nature.
* 安らか (yasuraka): This word emphasizes a feeling of comfort and relaxation, often used to describe a peaceful state of mind.
* 静寂 (seijaku): This word refers to a profound silence, often used to describe a sacred or contemplative setting.
* 平穏 (hei'on): This word implies a state of peace and stability, often used to describe a tranquil society or environment.
The best choice depends on the context and the specific meaning you want to convey.