She was launched on 28 April 1914 at Fairfield Shipbuilding and Engineering Company's shipyard at Govan. "Undaunted" participated in numerous naval operations during the First World War. On commissioning she was assigned as the leader of the 3rd Destroyer Flotilla of the Harwich Force, guarding the eastern approaches to the English Channel. On 28 August 1914, "Undaunted" took part in the Battle of Heligoland Bight, and on 17 October 1914 she was involved in an action off the Dutch island of Texel with German torpedo boats. On 25 December 1914 she participated in the Cuxhaven Raid, and on 24 January 1915 she took part in the Battle of Dogger Bank. In April 1915 "Undaunted" was damaged in collision with the destroyer , and on 24 March 1916 she was again damaged in a collision, this time with the light cruiser while covering the a raid on a Zeppelin base believed to be at Hoyer in Schleswig-Holstein. In November 1918 was reassigned to the 4th Light Cruiser Squadron of the Grand Fleet. She survived to see the end of the First World War, and was sold for scrap on 9 April 1923 to Cashmore, of Newport.