清静 (qīngjìng) describes a place or life that is quiet and peaceful, free from noise or disturbance — it emphasizes a desirable, calm atmosphere. 平静 (píngjìng) is broader, used for both external calm (e.g., sea) and inner composure; 宁静 (níngjìng) is more poetic and serene, often for nature or a deep sense of peace. 寂静 (jìjìng) implies a profound, sometimes eerie silence, while 静 (jìng) is the simple adjective for 'still, quiet'.