obstinacious

Example:The stubborn boy refused to admit he was wrong.

Definition:Unwilling to change one's opinion or attitude, even when faced with evidence to the contrary, giving in to one's will, and holding rigidly to one's purpose or intentions.

Example:He is inflexible about his views on climate change.

Definition:Not capable of bending; rigid, especially in opinion or attitude, unwilling to change or be changed, and infirm or prone to disease, especially in anatomy and medicine.

Example:She remained unyielding in her refusal to participate in the event.

Definition:Not giving in or yielding to persuasion, pressure, or effort, and characterized by or tending to be firm and inflexible, especially in opinion or attitude.