けつい決意ketsui
1.
The act of clearly defining one's intended course of action or attitude, accompanied by a firm commitment to follow through with that decision.
2.
A profound mental state characterized by a strong intention to act on a significant matter, reflecting a determination that is unwavering.
3.
The process of making a definitive choice regarding an important issue, embodying the emotional resolve to see that choice executed.
Example:
彼女は私に自分の決意を知らせてくれた。