ob·du·rate (ŏbd-rĭt, -dy-)
1. Not changing in response to argument or other influence; obstinate or intractable: "Everyone in the region has been obdurate in water negotiations with everyone else" (Marq de Villiers).
a. Hardened in wrongdoing or wickedness; stubbornly impenitent: "obdurate conscience of the old sinner" (Sir Walter Scott).
b. Hardened against feeling; hardhearted: an obdurate miser.
[Middle English obdurat, from Late Latin obdūrātus, past participle of obdūrāre, to harden, from Latin, to be hard, endure : ob-, intensive pref.; see OB- + dūrus, hard; see deru- in the Appendix of Indo-European roots.]
obdu·ra·cy (-dr-ə-sē, -dyr-), obdu·rate·ness n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.