Cool Head Meaning

Example : 1829, James Fenimore Cooper, The Wept of Wish-Ton-Wish, ch. 23:  [H]e had been engaged in divers hostile expeditions against the aborigines, and on all occasions had he shown a cool head and a resolute mind.1896, Mark Twain, Personal Recollections of Joan of Arc, ch. 5:  Joan had a cool head—the only cool head there—and she took command and brought order out of that chaos.1984 June 8, Janet Maslin, "Film: Ghostbusters, with Murray and Aykroyd," New York Times (retrieved 20 March 2014):  It requires a cool head, which Mr. Murray most assuredly has, as well as the ability to remain unruffled by bizarre apparitions.2006 Nov. 19, Christine Gorman, "What Ails The CDC," Time (retrieved 20 March 2014):  A telegenic personality who connected easily with journalists, Gerberding quickly became the public face of the CDC—a rare cool head among a parade of increasingly confused health bureaucrats.