noun, na-adjective
calm, cool, and collected; composed; unruffled
A yojijukugo describing a person who remains calm and level-headed even under pressure. Often used to praise composure in difficult situations.
彼は緊急事態でも沈着冷静だった。
He remained calm and collected even in the emergency.
沈着冷静な態度で交渉に臨んだ。
She approached the negotiation with a composed attitude.
A yojijukugo combining 沈着 (composure, calmness) and 冷静 (cool-headedness). The exact historical derivation is uncertain, but it follows a common pattern of pairing synonymous two-character compounds for emphasis.