Here are some synonyms for "obdurate":
* Unyielding
* Inflexible
* Unyielding
* Intransigent
* Impervious
* Resistant
Here's an example of how to use "obdurate" in a sentence:
* "Despite overwhelming evidence, the jury remained obdurate in their belief that the defendant was innocent."
The word "obdurate" often implies a negative connotation, as it suggests someone is being unreasonable or unwilling to compromise.