1) Imperturbable 2) Remaining calm 3) Resolute 4) Steady 5) Undaunted 6) Undismayed 7) Unshaken in purpose 1) Resolute 2) Steady 3) Undaunted 4) Undismayed 5) Unshaked 
HMS Unshaken was a British Ursula Class submarine of 540 tons displacement launched in the early 1940s. She was armed with one small gun and six 21-inch torpedo tubes in the bow. She had a top speed of 11.25 knots surfaced and 10 knots submerged and carried a complement of 27.