2 adjectives to describe resoluteness

Eteocles, although conscious of his father's curse, nevertheless declares with gloomy resoluteness that he will meet his brother in single combat, and, resisting the entreaties of the Chorus, goes forth to his doom.

In some, this faith may have strong and perceptible actings, wrestling through much discouragement and opposition, and many difficulties; as in the woman of Canaan, Matt. xv.; running through with peremptory resoluteness, saying, with Job, chap.

2 adjectives to describe  resoluteness