冷静 (-na inflection, hiragana れいせい, rōmaji reisei) = calm, composed e.g. "指し揮き官かんは冷れい静せいな人ひとでなければつとまらない。" Shikikan wa reisei na hito de nakereba tsutomaranai. = Only a calm person is qualified to be a commander.
