**Obstinacy** means stubbornness or refusing to change one's opinion or course of action despite persuasion. Here are some examples of how to use this word in English:
1. Despite being offered a better job with better pay, he refused to leave his current job because of his **obstinacy** and loyalty to his team.
2. Her **obstinacy** in refusing to admit she was wrong led to a breakdown in communication with her colleagues.
3. The teacher tried to explain the concept several times, but his **obstinacy** prevented him from understanding the material.
4. The politician's **obstinacy** on a particular issue cost him support from voters who were frustrated with his refusal to compromise.
5. The child's **obstinacy** in refusing to eat vegetables led to a power struggle with his parents.
6. The company's **obstinacy** in ignoring feedback from customers resulted in a loss of business and a decline in sales.
7. The coach's **obstinacy** in sticking to a training plan that was not working for the athlete led to injury and a loss of confidence.
8. The **obstinacy** of the two sides in a negotiation led to a deadlock and no agreement could be reached.
9. The patient's **obstinacy** in refusing to follow the doctor's advice delayed his recovery and led to complications.
10. The **obstinacy** of the union in refusing to negotiate with management resulted in a strike and lost production.