1598, William_Shakespeare, King Henry IV Part 2, act 2, sc. 2,Thou thinkest me as far in the devil's book as thou and Falstaff for obduracy and persistency.
1713, Nehemiah Walter, A discourse concerning the wonderfulness of Christ, Eleazer Phillips (Boston), p. 156,It might also serve to condemn the obduracy and hard-heartedness of the Jews, who relented not, when even the earth trembled and the rocks rent.
1812, Percy_Bysshe_Shelley, "On Leaving London for Wales," ln 5-6,True mountain Liberty alone may heal The pain which Custom's obduracies bring.
2007, Simon Hughes, "Chanderpaul finally outwitted by master" Telegraph.co.uk, 20 June,Chanderpaul's obduracy might have broken lesser men, but Panesar more than matched him for relentlessness.
