れいせい
cool, calm
Cold and quiet together, which is a temperature rather than a mood. A ray れい of it, and the same shh せい as 静か. Let us talk about it in that state: れいせい.
平気 へいき is being unbothered by a thing. 冷静 is keeping your head, and you can manage it while extremely bothered.
This is one of 1,500 words in Emaki, a free spaced repetition trainer with a written mnemonic on every card.
Study 冷静 in EmakiFree, no account needed. Your progress stays in your browser.
Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.