STUBBORN
stubborn
Adjective
- Refusing to move or to change one's opinion; obstinate; firmly resisting.
- He is pretty stubborn about his political beliefs, so why bother arguing?
- Blood can make a very stubborn stain on fabrics if not washed properly.
The above text is a snippet from Wiktionary: stubborn
and as such is available under the Creative Commons Attribution/Share-Alike License.