冷静 (lěng jìng) is an adjective meaning 'calm'—especially the kind of calmness shown when facing stress, danger, or strong emotions. Literally, 冷 ('cold') suggests emotional detachment or lack of heat/impulse, while 静 ('still, quiet') conveys mental stillness and composure. Together, they describe a state of clear-headed self-control, not just physical quietness or absence of noise.

This word is commonly used to praise someone’s ability to think clearly under pressure—for example, during emergencies, arguments, or high-stakes decisions. It implies rationality, emotional restraint, and level-headedness. While it can describe temporary behavior ('Stay calm!'), it’s also used to characterize a person’s general temperament ('She’s very calm'). It’s neutral-to-formal in register and appears frequently in news reports, psychological discussions, and everyday advice.