obstinacy

His obstinacy prevented him from seeing the truth.

Her obstinacy in refusing to compromise led to the project's failure.

Despite his obstinacy, he eventually had to admit he was wrong.

The team's success was hindered by the manager's obstinacy.

His obstinacy in following outdated methods cost the company a lot of money.

The negotiations were stalled due to the obstinacy of both parties.

Her obstinacy often led to conflicts with her colleagues.

The teacher tried to reason with the student, but his obstinacy was hard to break.

The company's downfall was attributed to the CEO's obstinacy in ignoring market trends.

His obstinacy in sticking to his beliefs made it difficult for him to accept new ideas.