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.]
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