adj. stub·born·er, stub·born·est
a. Refusing to change one's mind or course of action despite pressure to do so; unyielding or resolute. See Synonyms at obstinate.
b. Characterized by a refusal to change one's mind or course of action; dogged or persistent: stubborn prejudice; stubborn earnestness.
2. Difficult to treat or deal with; resistant to treatment or effort: stubborn soil; stubborn stains.
[Middle English stuborn.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. 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.