undauntable

He used the undauntable oak, which took more work splitting than any other wood because of its hardness.

She was resolute, he saw; undauntable; with no more fear of him than of a worm.

The tale of resultant death and suffering was long and sad, and testified to the undauntable heroism of human scientists.

Doris Kearns Goodwin, as her disarming memoir shows, was a born mascot - an endearing emblem of high hopes and undauntable energy.

Gentlemen, nothing was more remarkable in these fine descendants of our forefathers than the invincible determination with which they fought against odds, and the undauntable spirit with which they resisted defeat.

If the village wasn't where it was supposed to be she would walk until she found it, or take a taxi, or lie down somewhere with her head on her folded-up cloak, and sleep the undauntable sleep of youth.

Rambert, who was known for her undauntable spirit and the cartwheels she turned almost until her death in 1982, made that decision at the suggestion of Norman Morrice, a company member who became artistic director of both the Rambert and later the Royal Ballet.