Obstinacy (noun)

The quality of being stubborn or resolute in the face of opposition or difficulty; tenacity in maintaining a course of action despite difficulty or resistance.

Origin:

Derived from the latin word "obstinatus" meaning "stubborn, persistent", it was first recorded in the late 16th century.

Examples:

1. Her obstinacy made it impossible for her to change her mind.
2. His obstinacy in sticking to his beliefs caused a lot of tension in the team.
3. The obstinacy of the mule made it hard to get him to move.
4. She was known for her obstinacy and her determination to get what she wanted.
5. His obstinacy was admirable, he never gave up even when the odds were against him.