Stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade one to do so. Despite the evidence presented to him, he remained obstinate in his beliefs.
Difficult to manage, control, or subdue; resistant to guidance or discipline. The obstinate weeds in the garden refused to be eradicated, no matter how much effort was put into removing them.
Not easily cured, removed, or alleviated; persistent (especially of a medical condition or symptom). She was plagued by an obstinate cough that lingered for months.