冷静

1. Origins, structure, and basic meaning

• Structure: 冷静 (れいせい) is a noun and na-adjective for a calm state in which judgment is not overwhelmed by emotion.
• Basic usage: Use 冷静に to modify an action and 冷静な before a noun.
  • 予想外の質問にも冷静に答えた。 — I answered calmly even when asked an unexpected question.
  • まず冷静な判断ができるまで少し待とう。 — Let's wait until we can make a levelheaded judgment.

2. Common pitfalls and similar expressions

• Composure and coldness
  • 冷静 describes composed judgment and differs from 冷たい, which can describe emotional coldness. Calm or levelheaded is often the intended sense.